Product Description: 100% brand new and unused An extra large LCD screen displays note name and tuning process Tuning much easier with a moving hand on the screen and back lights. Two colour backlights: yellow - Sharp or Flat; green - In Tune. Tuning extremely sensitive and stable Easy to operate with only one control switches Easy to clip onto any instrument. A4 Frequency 440HZ Specification for Tuner: Tuning Item: Chromatic Tuning Range: A0(27.5HZ)- C8(4186HZ) Fit for : Guitar Bass Violin Ukulele Oud Cello Viola et Power: CR2032 Battery 1 piece (included) Color: Black Size: 48mm x 73mm x 28mcm Net weight: 23g Package Include: 1 x Tuner 1 x Battery (CR2032)