eno ET-31V clip-on tuner is professionally designed for violin family, it features violin, viola, cello, double bass and chromatic tuning items, auto tuning mode, easy for operation, bright LCD display and pendulum motion for clearly indicating. Super -interference, high accuracy, fast response, best choice for your instruments. Features: Automatic tuning mode, tuning items including violin, viola, cello, double bass and chromatic. 440Hz A4 frequency, A0(27.5HZ)~A6(1760HZ) tuning , super -interference, high accuracy and sensitivity. Auto tuning modes, one button for choose tuning items, pretty easy for operation. Bright LCD display with red and green backlit, pendulum motion for clearly indicating it is in tone or out of tone. Clip-on design, directly detects the vibration from the instruments offers it finest vibration sensor. Mini size, free 180 degree angle adjustment, with silicone pads inside of the clip. Powered by 1 * CR2032 lithium battery(not included). Specifications: Brand: eno Model: ET-31V Display: LCD Tuning Mode: Auto Tuning Item: Violin / Viola / Cello / Double Bass / Chromatic Tuning : A0(27.5HZ)~A6(1760HZ) A4 Frequency: 440Hz Power Supply: 3V(CR2032) Lithium Battery(Not Included) Item Weight: 30g / 1.1oz Package Size: 7.5 * 5.0 * 4.5cm / 3.0 * 2.0 * 1.8in Package Weight: 41g / 1.5oz Package List: 1 * Clip Tuner 1 * User Manual(English / Chinese) Note: The instrument is not included. The battery not included.