Feature 1. Plastic Material: The tuner is made of plastic material, which is durable and resistant to wear, providing long-term use without quality concerns. 2. Support Frame: The unique support frame design offers convenient usage and placement. Made from environmentally friendly plastic with a safe composition. 3. Automatic Shutdown Function: The device automatically powers off after 5 minutes of inactivity to conserve battery life. 4. Auto Save: Equipped with an automatic save system that retains settings after each shutdown to prevent data loss. 5. Suitable for: Features a clear LED display with night light mode, ideal for instruments such as zither, piano, violin, lute, and other string instruments. Item Type: Metronome tuner Product Material: Plastic Weight: 128.00g / 4.52oz Battery Type: 2 AAA batteries required (included) Battery Capacity: 1600mAh Sound Settings: Zither, Piano, Lute, Violin, Twelve-Tone Equal Temperament Calibration Range: A0 (27.5Hz) to C8 (4186.0Hz) A4 Range: 430Hz to 450Hz Signal Pickup Method: Microphone, pickup Product Dimensions: Approx. 108 x 65 x 17mm / 4.3 x 2.6 x 0.7in Package List 1 x Tuner 1 x Pickup Clip 2 x AAA Batteries Note: Shipped with included batteries.