Feature: 1. Tuning indicator clear and accurate to operate 2. Dual system pickup built-in microphone more convenient and quick tuning 3. External pickups vibration buzzers and pickups are all sensitive 4. Foldable back support frame easy to observe the screen when using put away when carrying 5. Suitable for various musical instruments sax trumpet gourd Chinese bamboo flute etc. Specification: Item Type: Metronome Power: 2 x AAA batteries(not included) Color: Black Tuning Items: Twelve averages guitar bass violin wind instruments Tuning Mode: C Beat Speed Range: 30-250bpm Tuning Range: 0A-8C Beat: 0-9 A4 Frequency Range: 430HZ-450HZ Duration: 0-8 Pickup Accuracy: 1 cent Beat Error: 1% Size: Approx. 10 x 6.2cm / 3.9 x 2.4in Package List: 1 x Metronome 1 x Pickup Clip 1 x User Manual