Sennheiser HD 450BT Noise-Canceling Wireless Over-Ear Headphones (White) - Manual (Page 11)

Using the headphones
HD 450BT | 11
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 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 (> 7).
Once the headphones are fully charged, the LED flashes blue 5x and
then goes off. 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.
While the headphones are being charged, you can still listen to
music or make phone calls. In this case, however, the charging time
may be longer.
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:
Right R
2 HRS
USB-A
USB-C
LED Off