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Using the headphones
10 | HD 250BT
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 up to 3.5 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 red (> 7).
Once the headphones are fully charged, the LED lights up blue.
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 com-
patible standard USB power supply for charging the headphones.
Charging the headphones' rechargeable
battery
1. Connect the USB-C connector of the charging cable to the USB
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
lights up red Rechargeable battery is being charged
lights up blue Rechargeable battery is fully charged
If the LED does not light up immediately during charging, clean
the charging socket and charge the headphones until the LED
lights up again (> 10).
Right R
3,5 HRS
USB-A
USB-C
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