Features: Tempo: 30 to 280bpm Beat Value: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 Accuracy: ±0.001 Power Supply: 1 x 3V Cell Battery (Included) Mini professional metronome. Multi-functional,lightweight & portable, easy to use. Tap function enables you to test your ideal tempo or tempo of a track. Stereo earphone jack is available. Clip and lanyard hole designed, easy to carry and easy to fix. Specifications: Color: White, Black Product size: 5.5 x 3.2 x 2.1 cm Net weight: 19g Package weight: 26g Packing Content: 1 x Mini Metronome 1 x User\"s Manual 1 x 3V Cell Battery (CR2032)