USB: Connect to U disk (maximum support 32GB)TF: Connect to TF memory card (maximum support 32GB)AUX: Audio Input InterfaceVOL-: Short press is the last song; Long press is the volume reduction.PLAY/PAUSE: Short press is the switch between pause and playback; Long press is the radio FM automatic station.VOL+: Short press is to choose the next song; Long press is to increase the volume.MODE: Switchover of USB/TF/FM/LINE IN/BLUETOOTH VoiceMain control IC: AC5322BBluetooth IC: AC5322B Bluetooth version is version 5.0Music format: MP3/WMA/WAV/FLAC/APE lossless format musicPower: 2 * 3W, connected to two 3W speakersRadio FM Frequency: 87.5-107.5 MHZIntroduction of Support Functions: Support MP3/USB/TF/LINE IN/FM/BLUETOOTH/Remote Control/DC 5VAbout structure: panel size: 107 * 25 MM, panel corner and screw hole position, then cover surface, the depth of the board is 32 MMDescription of recording function1. Press the MODE button for a long time to start recording, and then press the MODE button for a long time to cancel recording function.2. Press the PLAY/PAUSE key to play the recording file.3. When recording, it is more necessary to connect a storage device, such as a U disk or a TF card.Colour: Blackmaterial: plasticPackage Contents:3 * Bluetooth 5.0 DC 5V Amplifier Decoder Board12 * CableOnly the above package content, other products are not included.Note: Light shooting 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.