Panel function button schematic:1. LCD display: It can display the title of Chinese and English songs, copy the songs and corresponding lyrics files into the U disk at the same time, and display the lyrics of the played songs synchronously.2. In USB/s mode: Short press for playback pause key/Fm radio mode: Short press for automatic search station.3. BT/USB/s mode: Short press is the last song, long press is the volume reduction. / Fm radio mode: Short press is the last one, long press is the volume reduction. / AUX mode: Long press is the volume reduction.4. USB/s mode: Short click is optional for muffler or 10 + function. (Software should set two functions before shipment.)5. BT/USB/s mode: Short press for the song and long press for volume plus/Fm mode: Short press for the song and long press for volume plus/AUX mode: Long press for volume plus.6. REC Recording Key: Press this key during USB/s working hours to record the voice of MIC port. The length of recording depends on the capacity of the U disk or s card used. Press this key when playing the music U disk with recording files, it can quickly cut to the recording file for playback, so that users can quickly find the recording files. (In AUX, USB/s , FM, if any device of U disk and s is plugged in, long press REC key for 2 seconds to start recording.In the recording process, short press REC key to end recording and play back the contents just recorded. If the user is listening to music in s , he can quickly cut the recording file to play, such as the current recording file that the user listens to. Do not want to be able to clear the current REC recording file by pressing MODE key for 2 seconds in the process of playing the recording file, please be not to delete the content.7. USB/s boot-up defaults to full circular playback. Press this k to switch to single circular playback.8. MODE key: Shortly press AUX/USB/s /BT/FM to switch between several modes. / Press this key to delete the currently playing recording file when playing the recording file.9. EQ key: When playing USB/s music, press this key to switch between five kinds of EQ sound effects.10. Receiver.11. U-disk socket, supporting lossless format decoding APE, FLAC, WMA, WAV, MP3, etc.12. s card socket, supporting lossless format decoding APE, FLAC, WMA, WAV, MP3, etc.Audio Format Support:APE, FLAC,MP3, WMA, WAV, MP1, MP2Balanced Out:YesScreen:YesBattery Life:Less than 10 hoursStyle:Pure Audio MP3Function:Voice Recorder,FM Radio,BluetoothScreen Size:0.9 inchesSupports Recording Function:YesSignal Noise Ratio:3dBBattery Specification:AA BatterySupports FM:YesHave Speakers or not:YesStorage Type:Hard DiskOperation Mode:Touch ToneBluetooth:YesNote: 5V supply direction cannot be reversed, the wrong connection will burn the boardSupport 32G memory card colour:blackMaterial:plasticPackage Contents:1 * Audio Decoder Board1 * Remote ControlOnly 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.