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Using the headphones
CX 350BT | 9
Using the headphones
Information on the rechargeable battery
and the charging process
The headphones have a built-in rechargeable battery. A complete
charging cycle takes approx. 2.5 hours.
Before using the headphones
for the first time, charge the rechargeable battery for a complete
charging cycle without interruption.
When the headphones are being charged, the LED lights up (> 6).
When the battery charge drops to a critical level, a voice prompt asks
you to recharge the headphones (“Recharge headset”).
Sennheiser recommends using the supplied USB cable and a compa-
tible standard USB power supply for charging the headphones.
Charging the headphones' rechargeable
battery
1. Connect the USB-C connector of the USB cable to the USB-C
socket of the headphones.
2. Connect the USB-A connector to a corresponding socket of a USB
power source (to be ordered separately). Make sure that the USB
power source is connected to the power supply system.
The charging process of the headphones begins. The LED dis-
plays the charge status:
LED Meaning
flashes red Rechargeable battery is being charged
(charge level is very low)
lights up red Rechargeable battery is being charged
(charge level approx. 50%)
lights up
purple
Rechargeable battery is being charged
(charge level approx. 75%)
lights up blue Rechargeable battery is fully charged
USB-A
USB-C
2,5 HRS
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