OWNER’S MANUAL
Omnidirectional portable
speaker
Please read this manual carefully before operating your set and retain it for future
reference.
Model
XO3QBK
XO3QPK
XO3QBE
2208_Rev02
www.lg.com
Copyright © 2022 LG Electronics Inc. All Rights Reserved.
2
Omnidirectional portable speaker
Quick Guide
Using Easily in Order
d
c
a
b
a Charge the speaker before using it by opening the rear cover and
connect the speaker to an AC adapter (not provided).
b To use this speaker, turn it on by pressing the power
button.
Omnidirectional portable speaker Quick Guide
3
c Connecting the speaker to a smartphone via Bluetooth ([ See
“Connecting Smartphone to the Speaker via Bluetooth” on page
11.)
A Press the Power button to turn on the product. Bluetooth LED blinks blue.
B Tap the Settings
button on your smartphone and select Bluetooth. Turn on the Bluetooth function.
( Off > On)
C From the list of smartphone devices, nd and tap on “LG-XO3Q(XX).”
D Once the smartphone is connected to the product via Bluetooth, the Bluetooth LED will turn on blue. Play a
desired track in the music app on your smartphone.
d Connecting to an External Device ([ See “Connecting via
3.5 mm Stereo Cable” on page 22.)
A Press the Power button to turn on the product.
B Open the back cover of the product and connect the external device to the AUX terminal via a 3.5 mm stereo
cable.
C Turn the external device on and start playing.
e Connecting the LG XBOOM App ([ See “Installing app” on page
16.)
A Find the LG XBOOM app on the Google Play or App Store and install it on your smartphone.
B Run the LG XBOOM app and use its functions. (EQ, Wireless Party Link, Lighting, Sleep Timer, Setting etc.)
f Power Saving ([ See “Power Saving Mode” on page 23.)
If there is no playback or button input for 15 minutes, the product turns off automatically. On the LG XBOOM
app, you can enable or disable [Auto Power Management].
4
Table of Contents
Omnidirectional portable speaker
Quick Guide
2 Using Easily in Order
Exploring the Product
5 Top
7 Back
Charge
9 Charging the Battery
10 Checking Battery Status
Connecting to Bluetooth
11 Connecting Smartphone to the Speaker via
Bluetooth
14 Connecting with two smartphones
Connecting to the LG XBOOM
App
16 Installing app
18 Using the Wireless Party Link
Connecting to an External Device
22 Connecting via 3.5 mm Stereo Cable
Additional Functions
23 Initializing the Software
23 Power Saving Mode
24 Using Auto power - on.
24 Voice feedback function
Safety Precautions
25 Safety and Regulatory
Things to Check before Reporting
Malfunction
28 Troubleshooting
Appendix
29 Product Specications
30 Registered Trademarks and Licenses
31 Handling the Product
5
Exploring the Product
Top
b c d c ea
a
Battery LED
Please check the battery charging level and battery status. ([ See “Checking Battery Status” on page
10.)
b
Mood lighting
Press the button to select the desired mood lighting.
• Mood lighting: Ambient / Nature / Party / Off
c
Volume
It controls the volume level.
d
Play/Pause
Press the button to operate the product.
• Play/Pause: Press the button.
• Moving to the next music: Press the button twice quickly.
• Moving to the previous music: Press the button three times quickly.
• Mute: Press the button in AUX function.
Exploring the Product
6
e
Bluetooth
You can change the Bluetooth settings.
• Connecting an additional smartphone: Press and hold the button for 2 seconds. ([ See “Connecting
with two smartphones” on page 14.)
• Changing from AUX to Bluetooth: Press the button.
• Resetting Bluetooth: Press and hold the button for 7 seconds. ([ See “Initializing the Software” on
page 23.)
Bluetooth LED
Indicates the Bluetooth connection status.
•
Blinks in blue: Ready for Bluetooth device connection.
•
Turns on in blue: Connected to a Bluetooth device.
•
Turns on in white: Aux cable connected. / This speaker is connected to the other speaker via
Wireless Party Link.
. CAUTION
• Place the product at a safe distance from the child’s reach. Otherwise it may result in the product falling down
and causing personal injury and/or property damage.
• Be careful that the speaker does not fall down. Otherwise it may result in the speaker malfunctioning and
causing personal injury and/ or property damage.
7
Back
e
f
c d
b
a
g
a
Poles
This product can be secured to wrap around this pole with a security cable lock.
b
Strap hole
You can carry this product by attaching the strap to the strap hole.
c
(DC IN)
Plug in a USB (C-Type) cable to charge the speaker battery.
d
AUX
You can connect the product to a portable external device with a 3.5 mm stereo cable and start enjoying
music.
e
Back Cover
Make sure to fully close the back cover after use.
• Ingress Protection: IP54
- Solid: Protected against dust
- Liquid: Protected against splashing water.
8
f
Power
It turns on/off the product.
• If you press and hold the Power
button for 2 seconds with product turned on, you can see the
battery status on the battery LED.
g
Strap hole cover holder
When attaching the strap to the strap hole, keep the strap hole cover on the bottom of the speaker to
avoid losing it.
• Use it only to keep the strap cover. Do not attach the strap.
. CAUTION
• Be careful not to expose the product to sunlight for a long time to prevent discolouration.
• Be careful as the speaker may be damaged if you inadvertently press the woofer within the reach of your hand.
• Be careful not to drop the speaker. Mechanical shock may cause deterioration of water-resistant and dust-
resistant performance.
9
Charge
Charging the Battery
This product has a built-in battery. Make sure to charge the battery sufciently before use.
a Open the back cover and connect the USB cable to
(DC IN) port of the speaker.
b Connect the supplied USB cable to the AC adapter (not provided).
c Plug the AC adapter into an AC outlet.
a
b
c
Note
• It takes about 5 hours to fully charge the speaker. The charging time may differ depending on the battery
status or the product operation status.
• Once the battery is fully charged, you can use the speaker for about 24 hours.
- Operation time may vary depending on the battery or operation status.
. CAUTION
• AC adapter is not supplied. It is recommended that you use the 5 V AC adapter approved by LG Electronics Inc.
(more than 2 A) with this speaker because of danger of explosion. If you do not use the recommended adapter,
charging is unavailable or charging time may differ.
Charge
10
Checking Battery Status
Charging Status
When the battery of the product starts charging, you can see the charging status in the battery LED.
Battery LED LED Status / Battery Status
Turns on in green. / Charging is complete.
It is red. / Charging is in progress.
Note
• Playing tracks while charging may lengthen the charging time.
• When the speaker’s battery is fully charged with the power off, the battery LED lights up green for 15 seconds
and then off.
Use Status
When the product is turned on, the battery status is displayed on the battery LED for 3 seconds.
If you press and hold the Power
button for 2 seconds with product on, you can see the battery LED for 3
seconds depending on the battery status.
Battery LED LED Status / Battery Status
Turns on in green. / The battery level is above 70 %.
Turns on in amber. / The remaining battery level is 70 to 10 %.
It blinks red continuously and you can hear a notication sound once. /
The battery level is below 10 %, and the battery needs to be charged.
Note
• The battery status cannot be checked while charging.
11
Connecting to Bluetooth
Connecting Smartphone to the Speaker via Bluetooth
You can play music les stored on a Bluetooth device, or run music apps to enjoy the music with this product.
Please check the following rst.
• The following are the Bluetooth specications of the product.
- Bluetooth version: 5.1
- Codec: SBC, AAC
• How to connect the device to the product may differ depending on the type and model of the
Bluetooth device. For information on how to connect the product, refer to the user manual of the
Bluetooth device to be connected.
Select the [Bluetooth] menu on the smartphone's Settings screen. The menu access method may differ
depending on the smartphone manufacturer and model.
a Press the Power
button on the speaker to turn it on. Bluetooth LED blinks blue.
b Tap the Setting ( / ) button on your smartphone and select Bluetooth.
(Android Phone)
Connecting to Bluetooth
12
(iPhone)
c Turn on the Bluetooth function. ( Off > On)
d You will see a list of connectable devices on the smartphone screen. Find and tap the name “LG-XO3Q(XX)”.
LG-XO3Q(XX)
Bluetooth devices
LG Smart Phone
Bluetooth devices
On
AVAILABLE DEVICES
Bluetooth
LG-XO3Q(XX)
Bluetooth devices
LG Smart Phone
Bluetooth devices
On
AVAILABLE DEVICES
e Once the smartphone is connected to the product via Bluetooth, the Bluetooth LED will turn on blue.
f If LG-XO3Q(XX) does not appear on the list, tap on the Refresh icon on an Android phone or restart
Bluetooth on an iPhone.
Bluetooth
Speaker
Bluetooth devices
LG Smart Phone
Bluetooth devices
On
AVAILABLE DEVICES
(Android Phone)
13
Not Connected
LG Speaeker1
Not Connected
Not Connected
Not Connected
Settings
LG Speaeker2
LG Speaeker3
LG Speaeker4
MY DEVICES
Now discoverable as “iPhone”
Bluetooth
Bluetooth
(iPhone)
g Select and play a track on the smartphone.
Note
• The closer the Bluetooth device is to the speaker, the better connection you will get.
• If the Bluetooth device is not connected, the Bluetooth LED blinks blue. Connect the product again.
• When using Bluetooth, adjust the volume of the Bluetooth device to an appropriate level.
• XX are the last two digits of the Bluetooth address. An example would be “LG-XO3Q(08).”
• When the product is charging, if you try to connect to the product via the Bluetooth device with a connection
history, the product will automatically turn on and connect to the Bluetooth device. You can control this
function in the LG XBOOM app. ([ See “Using Auto power - on.” on page 24.)
14
Connecting with two smartphones
Pairing (Connecting) Multiple Phones
a Connect the product and a smartphone rst. ([ See “Connecting Smartphone to the Speaker via Bluetooth”
on page 11.)
b Press and hold the Bluetooth
button on the product for 2 seconds until you hear a notication sound.
Bluetooth LED blinks blue for 60 seconds.
c Connect an additional smartphone to the product within 60 seconds. ([ See “Connecting Smartphone to
the Speaker via Bluetooth” on page 11.)
d When two smartphones and the product are connected, the Bluetooth LED turns on blue.
15
Note
• Multi-phone pairing (connecting) connects up to two smartphones.
• Even if two smartphones are connected, the product plays music only on one smartphone. If the music stops on
the currently played smartphone, it can be played on another smartphone.
• If you turn the speaker off and back on while two Bluetooth devices are connected, only the device connected
later is automatically connected.
• Only smartphones support multi phone pairing (connection). (Depending on specications of the connected
smartphones, multi phone pairing (connection) may not be connected.)
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Connecting to the LG XBOOM App
Installing app
Use the various functions of the speaker on the LG XBOOM app.
To install the LG XBOOM app, scan the QR code with an app or install LG XBOOM app on the Google Play or
App Store.
Please check the following rst.
• The LG XBOOM app is available in the versions listed below.
- Android OS: Version 5.0 or higher
- iOS OS: Version 10 or higher
- Minimum supported versions for each OS may change later.
Downloading with a QR code
a Scan the QR code with a QR code scan app.
b You will be directed to the page where you can download the LG XBOOM app. Tap the app to install it.
(Android Phone OS)
(iPhone OS)
Connecting to the LG XBOOM App
17
Downloading in Google Play or App Store
a Find the LG XBOOM app on the Google Play or App Store and install it on your smartphone.
(Android™ Phone)
(iPhone)
b Connect the smartphone to the speaker via Bluetooth. ([ See “Connecting Smartphone to the Speaker via
Bluetooth” on page 11.)
c Open the LG XBOOM app installed on the smartphone.
d Follow the instructions on the LG XBOOM app. Agree to the Terms of Service, notice windows, access
settings, etc.
e Start using the various functions on the LG XBOOM app.
Note
• The menu access method may differ depending on the smartphone manufacturer and OS.
• Google, Android, and Google Play are trademarks of Google LLC.
18
Using the Wireless Party Link
You can connect multiple speakers in the LG XBOOM app's Wireless Party Link. There are two ways for using the
Wireless Party Link: Dual mode and Multi mode.
Dual mode
Wireless Party Link Dual mode lets you enjoy stereo sound with two same model speakers.
Please check the following rst.
• The two speakers of the same model are needed. (e.g. XO3Q and XO3Q)
a Connect the speaker and a smartphone rst. ([ See “Connecting Smartphone to the Speaker via Bluetooth”
on page 11.)
b Tap the Wireless Party Link in the LG XBOOM app.
c Tap the Dual mode and connect another speaker following the instructions.
d You can see the Dual mode LED on the speakers.
• Main speaker: Bluetooth LED lights up blue and output Left channel sound.
• Other speaker: Bluetooth LED lights up white and output Right channel sound.
(Main speaker)
(Other speaker)
19
Connecting to your TV via Dual mode
a Follow the aforementioned instructions to connect two speakers via Dual mode. ([ See “Dual mode” on
page 18.)
b Press and hold the Bluetooth
button on the main speaker for 2 seconds. Then the Bluetooth LED will
blink blue for 60 seconds.
c In the TV settings, nd and select the main speaker within 60 seconds. You can listen to the TV sound
through two speakers.
Note
• When using in dual mode with a TV, you cannot control the speakers with the LG XBOOM app.
Multi mode
Wireless Party Link Multi mode lets you enjoy more powerful sound with multiple speakers.
Please check the following rst.
• You can connect multiple LG Bluetooth speakers. (XG9Q/XG7Q/XG5Q and XO3Q)
a Connect the speaker and a smartphone rst. ([ See “Connecting Smartphone to the Speaker via Bluetooth”
on page 11.)
b Tap the Wireless Party Link in the LG XBOOM app.
c Tap the Multi mode and toggle the function on.
d Search for nearby speakers and select the speakers you want to connect to.
e You can see the Multi mode LED on the speakers.
• Main speaker: Bluetooth LED lights up blue and the speaker outputs sound.
• Other speakers: Bluetooth LED lights up white and speakers output sound in sync with the main speaker.
(Main speaker)
(Other speakers)
20
Note
• The Main speaker connects only one Bluetooth device.
• When using Dual/Multi mode to connect multiple speakers, the multi phone pairing connection is not
supported.
• When you turn the speakers off and on again, the speakers do not automatically reconnect.
• If you connect a 3.5 mm stereo cable in Dual/Multi mode, Dual/Multi mode is canceled and then change to AUX
function.
• When you connect multiple speakers in Dual/Multi mode in AUX function, it will change to Bluetooth function.
• To change the connected Bluetooth device in Dual/Multi mode, press and hold the Bluetooth
button for
2 seconds. When you hear a beep sound and the Bluetooth LED blinks blue, connect to the desired Bluetooth
device.
• Keep the distance between the speakers as close as possible each other.
• Depending on the network environment, this function may not work well.
• The screen of a device such as a TV and the sound from the speaker may not match.
• When multiple speakers are connected in Multi mode, volume and EQ linkage between the Main speaker and
Other speakers is not available.
21
Interworking multiple speakers
This speaker interworks with other LG Bluetooth speakers such as XG9Q/XG7Q/XG5Q and XO3Q.
Dual mode
Same model
(e.g. XO3Q/XO3Q)
Main/Other
Volume O
EQ O
Lighting O
Auto Power Management O
Sleep Timer O
Multi mode
Same series
(e.g. XO3Q/XO3Q)
Main/Other
Lighting O
Auto Power Management O
Sleep Timer O
Multi mode
Other series
(e.g. XG9Q/XG7Q/XG5Q/XO3Q)
Main/Other
Lighting X
Auto Power Management X
Sleep Timer O
22
Connecting to an External Device
Connecting via 3.5 mm Stereo Cable
You can connect the product and various external devices via a 3.5 mm stereo cable to enjoy the
music.
a Press the Power button to the turn on the product.
b Open the back cover of the product and connect the external device to the AUX terminal via a 3.5 mm stereo
cable.
c If you play music on the connected external device, you can start listening on this product.
Note
• Prepare a 3.5 mm stereo cable. If you do not have a 3.5 mm stereo cable, you can purchase one separately.
Connecting to an External Device
23
Additional Functions
Initializing the Software
It Initializes the Bluetooth connection and settings of the product.
a Press and hold the Bluetooth
button on the product for 7 seconds or longer.
b All white LEDs will blink four times to Initialize the Bluetooth connection and all settings.
Note
• To use the Bluetooth function after Initializing the product, connect the Bluetooth device again.
Power Saving Mode
If there is no playback or button input for 15 minutes, the product turns off automatically. You can enable or
disable the power saving mode as follows.
Function How to Use
Enable Set [Auto Power Management] to [Enable] in the LG XBOOM app.
Disable Set [Auto Power Management] to [Disable] in the LG XBOOM app.
Note
• When the power saving function is off, the product turns off only when the Power
button is pressed or the
battery is discharged.
Additional Functions
24
Using Auto power - on.
You can easily use the speaker with your Bluetooth device.
Please check the following rst.
• The speaker has a history of Bluetooth connection with the Bluetooth device.
• The speaker is charging and the power is off.
a Tap the Setting button on your Bluetooth device and select
Bluetooth.
b Turn on the Bluetooth function. (
Off > On)
c You will see a list of connectable devices on the Bluetooth device screen. Find and tap the name “LG-
XO3Q(XX)”.
d The speaker power is turned on automatically. Then the Bluetooth device and the speaker are connected
automatically.
Note
• You can turn this function on and off with the LG XBOOM app only.
Voice feedback function
When you select a function or sound, the current status of the product is guided by voice. (English voice only)
You can turn this function on and off with the LG XBOOM app.
25
Safety Precautions
Safety and Regulatory
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER (OR BACK) NO USER-
SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
This lightning ash with arrowhead symbol within an equilateral triangle is intended to
alert the user to the presence of uninsulated dangerous voltage within the product’s
enclosure that may be of sufcient magnitude to constitute a risk of electric shock to
persons.
The exclamation point within an equilateral triangle is intended to alert the user to the
presence of important operating and maintenance (servicing) instructions in the literature
accompanying the product.
WARNING:
• TO PREVENT FIRE OR ELECTRIC SHOCK HAZARD, DO NOT EXPOSE THIS PRODUCT TO RAIN OR MOISTURE.
• Do not install this equipment in a conned space such as a book case or similar unit.
CAUTION:
• Do not use high voltage products around this product. (ex. Electrical swatter) This product may malfunction due
to electrical shock.
• No naked ame sources, such as lighted candles, should be placed on the apparatus.
• Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions. Slots and
openings in the cabinet are provided for ventilation and to ensure reliable operation of the product and to
protect it from over heating. The openings should never be blocked by placing the product on a bed, sofa, rug or
other similar surface. This product shall not be placed in a built-in installation such as a bookcase or rack unless
proper ventilation is provided or the manufacturer’s instruction has been adhered to.
• The apparatus should not be exposed to water (dripping or splashing) and no objects lled with liquids, such as
vases, should be placed on the apparatus.
• For safety marking information including product identication and supply ratings, please refer to the main
label on the bottom or the other surface of the product.
• Be careful to make sure children do not put their hands or any objects into the *speaker duct.
- * speaker duct: A hole for plentiful bass sound on speaker cabinet. (enclosure)
Safety Precautions
26
CAUTION concerning the Power Cord
The Power Plug is the disconnecting device. In case of an emergency, the Power Plug must remain readily
accessible.
Check the specication page of this owner’s manual to be certain of the current requirements.
Do not overload wall outlets. Overloaded wall outlets, loose or damaged wall outlets, extension cords, frayed power
cords, or damaged or cracked wire insulation are dangerous. Any of these conditions could result in electric shock
or re. Periodically examine the cord of your device, and if its appearance indicates damage or deterioration, unplug
it, discontinue use of the device, and have the cord replaced with an exact replacement part by an authorized
service center.
Protect the power cord from physical or mechanical abuse, such as being twisted, kinked, pinched, closed in a door,
or walked upon. Pay particular attention to plugs, wall outlets, and the point where the cord exits the device.
CAUTION when using this product in environments of low humidity
• It may cause static electricity in environments of low humidity.
• It is recommended to use this product after touching any metal object which conducts electricity.
27
For models using a battery
This device is equipped with a portable battery or accumulator.
CAUTION: Risk of re or explosion if the battery is replaced by an incorrect type.
For models using a built-in battery
Do not store or transport at pressures lower than 11.6 kPa (0.116 bar) and at above 15,000 m (9.32 miles)
altitude.
• replacement of a battery with an incorrect type that can defeat a safeguard (for example, in the case of some
lithium battery types);
• disposal of a battery into re or a hot oven, or mechanically crushing or cutting of a battery, that can result in
an explosion;
• leaving a battery in an extremely high temperature surrounding environment that can result in an explosion or
the leakage of ammable liquid or gas; and
• a battery subjected to extremely low air pressure that may result in an explosion or the leakage of ammable
liquid or gas.
Symbols
: Alternating current (AC).
0 : Direct current (DC).
: This is a class II equipment.
1 : Standby power state.
! : The power is turned on.
: Danger voltage.
28
Things to Check before Reporting
Malfunction
Troubleshooting
If you experience the following symptoms while using the product, please check them again. They may not be
malfunctions.
Symptom Cause and Solution
Power is not
supplied.
• The battery is discharged. Recharge the battery.
- Charge the product by connecting the power cord to the power input terminal.
There is no
sound or
the sound is
distorted.
• The volume of product or the connected Bluetooth device may be set to the
minimum. Adjust the volume of product or the connected Bluetooth device to the
appropriate level.
• Using an external device with the maximized sound may distort the sound. Lower the
volume of the external device to use.
Bluetooth
connection
failed.
• Check if the Bluetooth setting is enabled.
• Turn off the Bluetooth setting and on again on the Bluetooth device.
• Make sure there are no obstacles between product and the Bluetooth device.
• Bluetooth pairing (connecting) may fail depending on the Bluetooth device type and
the surrounding environment.
The product
does not
operate
normally.
• Battery discharge may cause the Bluetooth information to be deleted. If the product’s
power supply is blocked, previous settings may not be saved.
• Use this product in a place where the temperature and humidity are not too high or
low. If the problem continues, contact LG Electronics’ Customer Service Center.
• If a problem occurs while charging the battery of the product, the battery LED
alternates between red and amber and charging stops. Unplug the adapter from the
outlet.
The above
solutions do not
work.
• Initializes the settings of the product. Press and hold the Bluetooth
button on the
product for 7 seconds or longer. ([ See “Initializing the Software” on page 23.)
Things to Check before Reporting Malfunction
29
Appendix
Product Specifications
General
Power supply
5 V 0 2 A (AC adapter)
Built-in rechargeable battery
Power consumption Refer to the main label.
Dimensions (W x H x D)
Approx. 165.0 mm x 327.0 mm x 165.0 mm
(6.5 inch x 12.9 inch x 6.5 inch)
Temperature 5 °C - 35 °C (41 °F - 95 °F)
Humidity 5 % - 60 % RH
Ingress protection IP54
Input
AUX 1.0 Vrms (3.5 mm stereo terminal) × 1
Battery
Battery capacity Li-ion 7.4 V, 3900 mAh
Operating time
24 hours
Operation time may vary depending on the battery or operation
status.
Charging time
5 hours
Charging time may vary depending on the battery or operation
status.
• Design and specications are subject to change without notice.
Appendix
30
Registered Trademarks and Licenses
All trademarks and trade names are owned by their respective owners.
The Bluetooth® word mark and logos are registered trademarks owned by the Bluetooth SIG, Inc. and any use of
such marks by LG Electronics is under license.
Other trademarks and trade names are those of their respective owners.
“Made for iPhone,” and “Made for iPod” mean that an electronic accessory has been designed to connect
specically to iPhone, or iPod, respectively, and has been certied by the developer to meet Apple performance
standards. Apple is not responsible for the operation of this device or its compliance with safety and regulatory
standards. Please note that the use of this accessory with iPhone or iPod may affect wireless performance.
The system is compatible with the latest iOS. Depending on your iPhone/iPod software version, you may not
control your iPhone/iPod from the unit.
31
Handling the Product
When shipping the Product
Please save the original shipping carton and packing materials. If you need to ship the product, for maximum
protection, re-pack the product as it was originally packed at the factory.
Keeping the exterior surfaces clean
• Do not use volatile liquids such as insecticide spray near the product.
• Wiping with strong pressure may damage the surface.
• Do not leave rubber or plastic products in contact with the product for a long period of time.
Cleaning the product
To clean the product, use a soft, dry cloth. If the surfaces are extremely dirty, use a soft cloth lightly moistened
with a mild detergent solution. Do not use strong solvents such as alcohol, benzine, or thinner, as these might
damage the surface of the product.
