TF card slot: connect TF memory card (maximum support 32GB, not included); LED: digital color screen display, showing red AUX interface: audio input interface MIC: support call and recording function; USB interface: connect U disk PREV/VOL-: short press is to select the previous song; long press is to decrease the volume PLAY/PAUSE: short press is to switch between pause and play; long press is to radio FM automatic station; NEXT/VOL+: short press is to select song; long press is to increase the volume; MODE: Switch between USB/TF/FM/AUX/BLUETOOTH; Main control IC: AC6926 Bluetooth IC: AC6926 Bluetooth version is 5.0 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 / remote control connection / DC 5V or 12V (optional) About structure: Panel size: 75x50 MM, screw holes around the panel, the depth of the board is 18MM Recording function description 1. Long press the MODE button to start recording, and long press the MODE button again to cancel the recording function; 2. Press the MODE button again to play the recording file; 3. When recording, you need to connect a storage device, such as: U disk or TF card; size:75x50MM Material:ABS colour:White Package Contents: 1 x MP3 decoder board 1 x Remote control (not including CR2025 battery) 1 x cable Only 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.