7V-24V power supply. 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; SNR70dB; Radio frequency range: 87.5~108MHzSecond, the button function description:"PREV/VOL-" long press to decrease the volume; in USB/TF/Bluetooth/radio mode, short press to the previous song/previous stationShort press ""PLAY/PAU"" in USB/TF/Bluetooth mode to play/pause; long press to switch the mode,""NEXT/VOL+"" long press to add volume; in USB/TF/Bluetooth/radio mode, short press for next song/next station""MODE"" is a mode switch, a total of 5 modes (Bluetooth-TF-USB-FM-AUX).Material: plasticcolour: blackPackage Contents:1 x decoder1 x remote control4 x cableOnly the above package content, other products are not included.Note: Light 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.