Usage Tips:Specification: Main control IC: AC6925A Bluetooth IC: AC6925A Bluetooth 5.0 version Music format: MP3 / WMA / WAV / FLAC / APE lossless format Radio FM frequency: 87.5-107.5 MHZ Support function introduction: support MP3/USB/TF/LINE IN/FM/BLUETOOTH Working voltage: 12V Panel size: 50 * 24 mm, the depth of the board is 35mm Features: PREV/VOL-: Short press is to select the previous song; the long press is to decrease the volume NEXT/VOL+: Short press is to select the next song; the long press is to increase the volume PLAY/PAUSE: Short press is the switch between pause and play; the long press is the switch between USB / TF / FM / AUX / BLUETOOTH; in the FM state, the pause play button is automatically search Package includes: 1 *Bluetooth 5.0 Decoder Board 4 * Cables Note: This item comes without a retail box, but please rest assured that we will pack it well before shipping!