Joyo JE-303 Joyo Brand Solar Powered Tuner, Bright LED screen, Accurate Tuning JOYO's latest invention for a greener future! Musical instrument (strings) tuner with on/off Clip to Secure to Instrument Neck Chromatic Tuning: (does sharps and flats) Tuning Range: 0A(27.5Hz) - 8C (4186.01Hz)