Once the DM13 is connected to a USB adapter, simply switch the D.MODE switch to the "ON" position, and the DM13 will be powered directly by the USB without consuming battery power, which can also better protect the battery life!
So far everything has gone well with unit.I paired this with my samsung galaxy phone,Bose QC35 Bluetooth headphones and with my new Bose Soundlink Max Speaker ,No Problem The Fiio looks great and is well built...The new Discman