This hands-free call decoder board is a multi-functional decoder board. It supports Bluetooth and hands-free calls, call back function, dual use of earphone and power amplifier, folder selection play, USB / SD / Bluetooth / FM / AUX automatically switch and so on. Compact size and convenient for carrying. Features: 1. Support Bluetooth and hands-free calls. 2. Call back function. Long press MODE in Bluetooth model to redial the last call number. 3. Supported dual use of earphone and power amplifier(panel 3.5 earphone hub. If the earphone speaker does not ring when plugged in, it will ring when pulled out). Reserved output 3P terminal seat at the back of the board (optional). 4. Support folder selection play (remote control operation) - convenient for hierarchical use of different music cards or U disk to classify music into different folders. Long press up or down in play mode to select folder play (show F001,F002, etc.). 5. Loop mode: press "arrow" or "RPT" symbol key in the playing state: random (RAN) / single loop (ONE) / folder loop (FOL) / full song loop (ALL). If you press (FOL) in the current folder, only the full song will be played in that folder. 6. Support USB / SD / Bluetooth / FM / AUX automatically switch (AUX input terminal is in the 3P seat behind the board). Please leave a message if you want to change the message and cable number (English voice with message number / English voice without message number / Chinese voice with message number). If you do not leave a message, the default delivery is in English without message number. 7. Support MP3 / WMA / APE / WAV format music, electronic clock. MP3 songs 32-320kbps, WAV / APE is under 1411kbps. 8. Support USB / card switching, previous song, next song, volume adjustment, EQ, play / pause, stop, single repetition, mute, shutdown and direct selection of songs. 9. Support Bluetooth, previous song, next song, volume adjustment, play/pause, mute. 10. Support power off memory function: memory of the songs played before power off and the volume can be remembered to the current point. Specification: Size: Approx. 92 * 35 * 29mm / 3.6 * 1.4 * 1.1in Hole size: Approx. 75 * 27 * 29mm / 3.0 * 1.1 * 1.1in Screw hole center spacing: 80mm PCBA size: Approx. 71 * 29 * 20mm / 2.8 * 1.1 * 0.8in Voltage: 3.7 - 5V Current: 800MA - 1A Bluetooth Version: Bluetooth 5.0 Remote control battery: CR2025 Color: Black, Silver (optional) Package list: 1 * Bluetooth decoder 3 * Cable 1 * Remote Control