Specification Audio input mode 1 bluetooth receiver2 USB decoding play3 TF card decoding play4 FM radio need to weld wire antenna by yourself Supporting play format MP3 WMA WAV FLAC Power supply 1 DC 5V mobile phone charger can power small USB plug 2 External power supply interface for lithium battery powered use These two kinds of power supply can not be used at the same time Audio output mode 3 5mm audio output preamp output can directly promote the headset also can be connected to the use of rear stage poweramplifier Control 1 On board button control2 Remote controlNote Remove the translucent white plastic sheet from the bottom of the romote control before using it so to power on in the right way If you need the FM radio function please first DIY a long wire as antenna on the FM antenna area Package Included 1 x Amplifier Board1 x Remote Control