Key description: USB: Connect USB flash disk (up to 32GB) LED: digital color screen display, red infrared receiving module TF: Connect TF memory card (up to 32GB) AUX: audio input interface VOL -: Short press to select the previous song; Press and hold to reduce the volume PLAY/PAUSE: Press briefly to switch between pause and play; Press and hold to receive FM automatic channel search VOL+: short press to select the next song; Press and hold to increase the volume MODE: Switch of voice of USB/TF/FM/AUX/BLUETOOTH Special function description: 1. Support folder playback 2. Call support 3. Support recording. Recording only supports TF mode or USB mode. 4. Support power-off memory (support the last mode and volume memory. (The last setting before power-off will be played after power-off)) 5. Color display 6. The power supply voltage supports DC 5v and the current is between 0.5-2A. 7. The speaker can be directly connected with power amplifier and decoding function. 8. Support song format MP3/WMA/WAV/APE/FLAC 9. Main functions MP3/USB/TF/LINE IN/FM/BLUETOOTH/remote control/DC5V 10. The Bluetooth version is 5.0 11. Chip model: Zhongke Lanxun 5536B 12. Power 6W, true stereo dual channel. （2*3W） Package includes: 1 x MP3 Decoder Board with the Surface panel 1 x Remote Controller (Without battery) 2 x Power Cables