Great device! It works flawlessly. The battery works more than 10 hours with USB OTG. You can listen FLAC or MP3 converting directly to "DSD 256".
In PC "foobar2000" works great, all music real time converting to DSD256 format. ONKYO HF PLAYER (have real time DSD converting) app works superb with android OTG. CHARGING time with standart charger 1.5A or 2A nevermind it's a same 5 hours, stop charging after 5 hours. With USB cable in PC usb port charging time 7 hours and device stop charging, all time device is cold. You can use all time, listening and charging device the same time, xudoo xd- 05 is great.