Plastic Material: The tuner is made of durable plastic material that resists wear and ensures long-term use without quality concerns. Support Frame: The support frame features a unique design for convenient use and placement. Made from environmentally friendly plastic, it offers safe and reliable performance. Automatic Shutdown Function: The device automatically powers off after 5 minutes of inactivity to conserve battery life. Auto Save: Equipped with an automatic save system, the tuner retains settings after each shutdown to prevent data loss. Suitable for: Features a clear LED display with night light mode, suitable for instruments such as zither, qin, erhu, pipa, and other stringed instruments. Item Type: Metronome tuner Product Material: Plastic Weight: 128.00g / 4.52oz Battery Type: 2 AAA batteries required (included) Battery Capacity: 1600mAh Tuning Instruments: Zither, Qin, Pipa, Erhu, Twelve-Tone Equal Temperament Calibration Range: A0 (27.5Hz) to C8 (4186.0Hz) A4 Range: 430Hz to 450Hz Signal Pickup Method: Microphone, pickup Product Size: Approx. 108x65x17mm / 4.3x2.6x0.7in Package List: 1 x Tuner, 1 x Pickup Clip, 2 x AAA Batteries Note: Batteries included.