dear Digital Metronome M50 Tempo Metronome Clip-On Electronic Metronome Pocket Metronome Suitable for Guitar Piano Violin Drum and Other Instruments Multi-functional easy to use. Tap function enables you to test your ideal tempo or tempo of a track. back of product has clip and sling hole structure design easy to fixing and carry. Features: Tap function: Enable you test your ideal tempo or tempo of track tempo from 30 to 280 bpm. Convenient to operate: battery placing zone is easy to remove with a little effort front side designed with 5 buttons press on on/off and turn device on and /down button is adopted to cycle through functions. Easy to carry: back of metronome has clip and sling hole structure design easy to fixing and carry. Accuracy: ±1/1000 (one thousandth); Beat value: 0 1 2 3 4 5 6 7 8 9; adjustment: maximum medium minimum mute. Power supply: 3V cell battery x 1 piece (package not included) battery model: CR2032. Output: tempo metronome design has double channel headphone output. Besides you can easily change between TAP function and Metronome mode. Specifications: Color: Blue / Purple (Optional) Material: ABS Tempo: 30 to 280 bpm Beat Value: 0 1 2 3 4 5 6 7 8 9 Adjustment: Maximum ; medium ; minimum ; 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 Package List: 1 * Digital Metronome 1 * User Manual (English)