Key Description: USB: Connect U disk (maximum support 32GB) LED: Digital color screen display, red infrared receiver module TF: Connect TF memory card (maximum support 32GB) AUX: Audio input interface 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 automatically search for radio FM VOL: Short press is to select the next song; long press is to increase the volume MODE: USB/TF/FM/AUX/BLUETOOTH sound switch Special function description: 1. Support folder playback 2. Support call 3. Support recording. Recording only supports operation in TF mode or USB mode. (Long press the MODE button to start recording, long press the MODE button again to cancel the recording and play the recording file; when recording, it is more necessary to connect a storage device, such as a U disk or TF card;) 4. Support power off memory (support the last mode and volume memory. (The last setting before power off will be played after power on) 5. Color screen display 6. The power supply voltage supports between DC6v-18v, and the current is between 1-3A. 7. Can be directly connected to speakers, with power amplifier and decoding functions. 8. Support song format MP3 /WMA / WAV / APE / FLAC 9. Main functions MP3/USB/TF/LINE IN/FM/BLUETOOTHemote control/ 10. The Bluetooth version is 5.0 11. Chip model Zhongke Lanxun 5536A 12. Power 50W, true stereo dual channel. (2*25W) 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 the structure: Panel size: 75 * 50 MM, the panel is surrounded by screw holes, the depth of the panel is 18MM 2. Description of recording function 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;