8V-24V power supply 2*60W stereo Support folder selection for playback Support call/support recording (outside recording). Recording needs to be operated in TF mode or USB mode. (Long press the MODE button to start recording, long press the MODE button again to cancel the recording and play the recorded file; in the recording mode, you need to connect a storage device U disk or TF card;) Support USB/TF/Bluetooth/Radio/AUX automatic switching Support power failure memory function: memorize the song and volume before power failure The product with power amplifier supports balanced output, and the stereo power is 2*25W. Support MP3/WMA/WAV/APE/FLAC version of song decoding equal 70dB Radio frequency range: 87.5~108MHz Button function description: "PREV/-" long press to decrease the volume; in USB/TF/Bluetooth/radio mode, short press to the previous song/previous station Short press "PLAY/PAU" in USB/TF/Bluetooth mode to play/pause; long press to switch the mode, "/+" long press to add volume; in USB/TF/Bluetooth/radio mode, short press for song/ station "MODE" is a mode switch, a total of 5 modes (Bluetooth-TF-USB-FM-AUX). Colour:black+red+silver Material:PCB+Plastic+Metal Size:108 x 25MM 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 cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.