SMSL Audio M3 USB Powered Audio Decoder, Black M3 first USB-powered Audio decoder and charging treasure switching power supply technology computer or mobile phone USB direct power supply to improve The ease of use rechargeable power supply M3 Super fever power mode you have purchased M3 can have in the case of Mobile phones and at the same time charging power pod M3 will automatically switch off the power supply using USB power charging treasure M3 Flexible and convenient mode of operation The completion of a single bond and input select switch Plus a headphone volume knob allows the operator to look convenient and science Industrial intuitive power switch Volume knob allows the operator to look convenient and science Industrial intuitive power switch M3 Flexible and convenient mode of operation The completion of a single bond and input select