Feature1Plastic Material: The tuner is made of plastic material, which is durable and not easy to wear, and can be used by users for a long time without worrying about quality issues. 2Support Frame: The unique design of this support frame is more convenient for the use and placement of the product. The support frame is made of environmentally friendly plastic material and has a safe composition. 3Automatic Shutdown Function: If the user does not continue using after 5 minutes, the pickup will automatically shut down, which can save more power. 4Auto Save: This tuner is equipped with an automatic save system; After each shutdown, the system will automatically save parameters for you to prevent data loss. 5Suitable for: The LED display screen of the product is clearer than previous screens, and also has a night light mode; It is suitable for musical instruments such as guzheng, guqin, erhu, pipa, and so on.Item Type: Metronome tunerProduct Material: PlasticWeight: 128.00g/4.52ozBattery Type: 2 AAA batteries are required (shipped with matching batteries)Battery Capacity: 1600mAhPronunciation Projects: Guzheng, Guqin, Pipa, Erhu, Twelve Averaging RhythmsCalibration Range: A0 (27.5Hz) C8 (4186.0Hz)A4 Range: 430Hz to 450HzSignal Pickup Method: Microphone, pickupProduct Size: Approx. 108x65x17mm / 4.3x2.6x0.7inPackage List1 x Tuner1 x Pickup Clip2 x AAA BatteriesNoteShipped with matched battery.