1.Mini usb digital speaker 2.Apply MP3/MP4 and other audio sources 3.Supports ... elegant and lovely,enjoy the adornment and music 2,TF card, U disk, MP3compatible with widely ... support MP3 formatApply to PC, mobile phone ,MP3, MP4 and other audio sourceSupports FM radio function Rated Power ... : 150Hz-18KHzS/N Ratio: ≥80dbAmplifier distortion: ≤0.2%Power input: 3.7V Outside rechargeable li-ion battery ...