The headphones have a built-in rechargeable battery. A complete charging cycle takes up to 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 (> Overview of the LED display). Once the headphones are fully charged, the LED flashes blue for 5 minutes and then goes off. When the battery charge drops to a critical level, a voice prompt asks you to recharge the headphones (“Recharge headset”).
Sonova Consumer Hearing recommends using the supplied USB cable and a compatible 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.