Instruction Mode switch, single press to switch modes Next song/Volume+:At the USB/TF card mode, short press to play the previous music long press to decrease the volume 3 Previous song/Volume-: At the USB TF card mode, short press to play the previous music long press to decrease the volume Play/Pause: 1At the card mode single press to enter play/pause function 2 At the USB card mode, single press to enter play/pause function 3 At the TF crad mode,single press to enter play/pause function 6 USB charging jack: Red LED light indicates it is in cahrging full. the light is off if charging full USB cord charging 7 TF Card jack 8 Line-in jack • Playing time: 110 minutes • Power supply USB/built-in lithium Battery •SNR: > 80db •Size: 101*101 87 mm •Output power: 5W • Frequency response: 20H2-20KHZ • Transmission distance:10 meters.