PREV/VOL- long press to decrease the volume; short press in the USB/TF/Bluetooth/radio mode is the previous song/previous station PLAY/PAU in the USB/TF/Bluetooth mode, short press for play/pause; long press for mode switching, /VOL+ long press to increase the volume; short press in the USB/TF/Bluetooth/radio mode is the song/ station MODE is the mode switch, a of 5 modes (Bluetooth-TF-USB--AUX). 5V-12V supply Support folder and playback Support call/support recording (external recording). Recording needs to be operated in TF mode or USB mode. (Long press the MODE button to recording, long press the MODE button again to cancel the recording and play the recording file; in the recording mode, a device U disk or TF card needs to be connected;) Support USB/TF/Bluetooth/Radio/AUX automatic switching Support -off memory function: memorize songs and volume before -off Product with amplifier supports balanced output, stereo 2*25W. Support MP3/WMA/WAV/APE/FLAC version of song decoding S greater than equal 70dB Audio frequency range: 87.5-108MHz size:93 x 36mm Material:plastic colour:black Package Contents: 1 x Decoder board 3 x 2P cord 1 x 1P radio antenna 1 x remote control Only the above package content, other products are not included. Note: Light 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.