Features: 1.Clip and lanyard hole design, easy and convenient to carry and fix. 2.The product is designed with 3.5mm channel headphone jack. 3.Use this metronome to mark time by the means of regularly recurring ticks or flashes at adjustable intervals. 4.Tap function enables you to test your ideal tempo or tempo of a track. 5.Adjustable volume control: Max/medium/min/mute. Multi-functional, can be used for all types of instruments. Specifications: Condition: 100% Material: Plastic Headphone Jack Diameter: Approx. 3.5mm/0.14in Weight: Approx. 30g Size: Approx. 6 * 3.5*1.5cm / 2.4 * 1.4*0.6in Color: Black 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: 1 * 3V CR2032 Cell Battery(Not included) Package list: 1 * Metronome 1 * User Manual