Automatic clip-on chromatic tuner with built-in piezo sensor, tuning range A0 (27.5 Hz)~C8 (4186 Hz) and tuning precision ±1cent. Tuner automatically turns on when clipped on headstock and turns off when removed away, or after 5 minutes when kept on headstock (if it is used or not). Backlit operates with colour light signals to simplify the tuning process: it turns green when in tune, red when sharp, and orange when flat. Operates with one 3 V (CR2032) lithium battery. Dimensions: 48 x 44 x 27 mm, weight: 21 g, black colour with white Cherub logo.