Specifications: Color: Blue / Purple (Optional) Material: ABS Tempo: 30 to 280 bpm Beat Value: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 Volume Adjustment: Maximum volume; medium volume; minimum volume; mute Accuracy: ±1/1000 Power Supply: 3V, CR2032 cell battery (Not included) Item Size: 60 * 33 * 23mm / 2.36 * 1.29 * 0.91in Item Weight: 19g / 0.67oz Package Weight: 31g / 1.09oz Package Size: 11.8 * 7.8 * 2.5cm / 4.65 * 3.07 * 0.98in Features: 1、Tap function: Enable you test your ideal tempo or tempo of track, tempo range from 30 to 280 bpm. 2、Accuracy: ±1/1000 (one thousandth); Beat value: 0, 1, 2, 3, 4, 5 ,6, 7, 8, 9; Volume adjustment: maximum volume, medium volume, minimum volume, mute. 3、Power supply: 3V cell battery x 1 piece (package not included), battery model: CR2032. 4、Output: The tempo metronome design has double channel headphone output. Besides, you can easily change between TAP function and Metronome mode. 5、Convenient to operate: The battery placing zone is easy to remove with a little effort, the front side designed with 5 buttons, press on the on/off and turn the device on, the select and up/down button is adopted to cycle through the functions. 6、Easy to carry: The back of the mini metronome has the clip and the sling hole structure design, easy to fixing and carry. Package List: 1 * Mini Digital Metronome 1 * User Manual (English)