Specifications: 1,Double decoding,support MP3/WMA/WAV/APE/FLAC format music; 2,Bluetooth music and Wireless Bluetooth call function; 3,Display with digital tube; 4,Support USB/TF card; Label: Yes 5,Power off memory function; 6,Support 5-10 meters distance infrared remote control operation; 7,Support LINE-IN(AUX)/ LINE-OUT; 8,Support FM(87.5MHZ-108.0MHZ); 9,Buttons:VOL-/ AUTO / VOL+ / MODE; 10,Support power automatic protection system(the PCBA will not burn out if the positive and negative power is reverse,it only not working); 11,The highest volume level is 30; 12,Power supply: DC5V / 12V. It can work on 5V and 12V. Button Operation Instructions: 1,Vol- button (last song / volume reduction): in MP3 state, vol- is short pressed for the last one, long press for vol-; in FM state, short press is to increase one stage number; 2,Auto button (play / pause): in MP3 state, auto is short to play / pause; in FM state, short press is playing / pause, long press is automatic receiving station; 3,Vol+ button (next song / volume increase): in MP3 state, Vol is short pressed for next song, long press for vol+; in FM state, short press is to lower a stage number; 4,MODE button: switch between USB/TF/FM/AUX/BT functions in turn. Package Included: 1*Mp3 Player Decoder 1*Remote Control (Without the Battery) 1*Cables Note: This product does not have a power amplifier. When connecting, you must first connect the power amplifier, and then connect the speaker