Panel function button schematic:1. LCD display: It can display the title of and English , copy the and corresponding files into the U disk at the same time, and display the of the played 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 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 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 recording. In the recording process, short press REC key to end recording and play back the contents just recorded. If the is listening to music in s , he can quickly cut the recording file to play, such as the current recording file that the listens to. Do not to be 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 -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 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 kinds of EQ . 10. Receiver. 11. U-disk socket, supporting dual lossless decoding , FLAC, WMA, WAV, MP3, etc. 12. s card socket, supporting dual lossless decoding , FLAC, WMA, WAV, MP3, etc. Audio Support:, FLAC,MP3, WMA, WAV, MP1, MP2 Balanced Out:Yes Screen:Yes Battery Life:Less than 10 hours Style:Pure Audio MP3 Function:Voice Recorder,FM Radio,Bluetooth Screen Size:0.9 inches Supports Recording Function:Yes Signal Noise :3dB Battery Specification:AA Battery Supports FM:Yes Have Speakers or not:Yes Storage Type:Hard Disk Operation Mode:Touch Tone Bluetooth:Yes Note: 5V power supply direction cannot be reversed, the wrong connection will burn the board Support 32G memory card colour:black Material:plastic Package Contents: 1 * Audio Decoder Board 1 * Remote Control Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.