My unit seems to died out in a way like none other audio devices I've ever had did. It was perfectly fine left off and after 2 days just stopped to be detected, on Windows, Android, iOS, tried on different devices. Leds shows everything is ok but not every time, sometimes blue goes red when I turn down the volumne knob to minimum. Well, I love the sound of it... until it works :] I'm going to replace the battery by myself since 40 or more euros for open it up and plug in a new generic 3,7 V accu is pretty laughable. Must check again if I wrote to Ifi or to Apple