Specifications Ukulele tuner Clip-on tuning Tunes Uke key of C, key of D, and chromatic Easy to read screen, full green lights when in tune, full red lights when out Detection range: A0 (27.5Hz) - C8 (4186.00Hz) Pitch range: reference pitch from 430Hz - 450Hz (1Hz steps) Detection accuracy: +/- 0.5 cent Power supply: one 2032 coin battery Dimensions: 45.8 x 35.8 x 13.8 mm This Listing and Price is for 1 Tiki GoGo Tuner