Literally after a couple of months, it ceased to correctly determine the level of the battery. It seems like the charge is full ("5/6 hours left"), and then suddenly once, and you need to charge. Calibration with a full discharge / charge did not help. I wanted to return it under warranty. But the case burst in the area of the switching lever. Spat, sealed with superglue. A month or two later, the headset suddenly died during playback. Does not turn on, does not respond to charging.