Many uses: Make sure you install the battery correctly as the picture shows, then the metronome works well. Multi-function and professional battery operated mini metronome for piano, guitar, saxophone, flute, violin, drum. Tap function: This digital metronome allows you to test your ideal tempo or track tempo, tempo range from 30 to 280 bpm. Unique design: Lightweight M50 mini metronome with two-channel headphone output. The back of the metronome has a clip and lanyard hole, easy to carry and easy to fix. Features: Time value: The sound is a loud beep. 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. Volume adjustment: maximum volume, medium volume, minimum volume, mute. Easy to use: Place the battery in the metronome. The front panel is designed with 5 buttons, press the switch (on/off) to use the selection buttons and the up/down buttons to cycle through the functions. The mini metronome will automatically turn off after 3 minutes if no operation is performed.