Support folder playback.Support call/support recording (outside recording). Recording only supports operation in TF mode or USB mode. Support -off memory (support last mode and volume memory.The supply voltage: 5V, and the current is between 0.5-2A. Can be directly connected to speakers, with amplifier and decoding functions.Support song MP3/WMA/WAV/APE/FLAC, Main functions MP3/USB/TF/LINE IN//BLUETOOTH/remote control/DC12V The Bluetooth version is version 5.0. 6W, true stereo two-channel. (2*3W). Size 108x25MM Single weight: 40G Key operation introduction:1. VOL-button (previous song/volume ): in MP3 state, VOL-short press is the previous song, long press is the volume ;In the state, a short press is to increase a station number; in the Bluetooth function, a short press is for the previous bluetooth song, and a long press is for the volume to decrease. 2. PAUSE/PLAY button (play/pause): short press PAUSE/PLAY in MP3 state to play/pause; in In the state, short press to play/pause, short press to automatically and save the station; short press to play/pause under the Bluetooth function. 3. VOL+ button ( song/volume up): in MP3 state, short press VOL+ for the song, long press for volume up; In the state, short press is to lower a station number; in the Bluetooth function, short press is the song of Bluetooth, and long press is to decrease the volume. 4. MODE button: switch between USB / TF / / audio input / Bluetooth function in turn. Description of call/recording function 1. Press and hold the MODE button for 2 seconds to recording, press and hold the MODE button again for 2 seconds to cancel the recording and play the current recording file; 2. In recording mode, you need to a device: U disk or TF card. (Recording only supports USB/TF mode) 3. When there is an incoming call, long press the pause button to answer the call. Colour:black Material:PCB+Plastic+Metal Package Contents: 1 x decoder board 4 x cables 1 x remote control (without button battery) Only the above package content, other products are not included. Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.