Condition: 100% Brand New Item Type: MP3 Decoding Board Material: ABS Optional Color: Black, Silver Speaker Power: 3W*2 Speaker Impedance: 4 ohms Power Supply: 5V or 3.7V Lithium Battery Remote Control Battery: CR2025 FM Mode: Use the Mode button to switch the machine to FM mode (the default mode is FM when no USB/SD card is connected); Previous Song: Short press from high to low to search for radio, long press to decrease volume; Play/Pause: Short press to switch to the next stored station, long press for 3 seconds to perform automatic search and save station; Next Song: Short press low to high for radio, long press up for volume. Line Mode: Press Mode on the panel to switch the machine to Line Mode. The audio source is input via Line/DC, and the volume is controlled by an external audio source device. The volume can also be adjusted with the previous song and next song. The adjustment method is the same as the adjustment of the MP3 volume. Clock Adjustment: Press \"MODE\" on the panel to switch the machine to clock mode, press the play/pause button to select hour or minute, and then the selected part will flash, and then press previous or next to adjust the time (Note: the time should be adjusted again after each startup).