Many uses: Make sure you install the battery correctly as the picture shows, then the metronome works well. Multifunction and professional mini metronome with battery 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 a 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 control: maximum volume, medium volume, minimum volume, mute. Easy to use: put 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.