12V Folder Play With Power Amplifier MP3 Decoding Board With Recording Call Loss Motherboard With Bluetooth 1. Weight: about 40 grams 2. Size: about 9.3x3.6 cm 3. Power supply: 12V 4. Remote control power supply: you need to bring your own CR2402 button battery 5. Accessories: host x1, 2P power cord x3, 1P radio antenna x1, remote control x1 Features: 1. Support folder selection and playback 2. Support callssupport recording (external recording), recording needs to be operated in TF mode or USB mode (long press the MODE button to start recording, long press the MODE button again to cancel recording and play the recording file, a storage device needs to be connected in the recording mode U disk or TF card) 2. Support USBTFBluetoothRadioAUX automatic switching 3. Support power-off memory function: memorize songs and volume before power-off 4. With power amplifier to support balanced output, stereo power 2x25W 5. Support MP3WMAWAVAPEFLAC version of song decoding 6. Signal-to-noise ratio: 70dB or more 7. Audio frequency range: 87.5-108MHz Button function description: 1. PREVVOL- long press to decrease volume, short press in USBTFBluetoothradio mode to be the previous songprevious station 2. PLAYPAU in USBTFBluetooth mode, short press for playpause, long press for mode switch 3. NEXTVOL+ long press to increase volume, short press in USBTFBluetoothradio mode for next songnext station 4. MODE is the mode switch, a total of 5 modes (BluetoothTFUSBFMAUX)