Automatic, clip-on tuner, chromatic;Switches on automatically when placed on the instrument;Switches off automatically after 5 min or when removed from the instrument;LCD needle display with backlight, colour change when tuned correctly;Accuracy +/- 1 cent, calibration 440 Hz;Accessories required: 1 x CR2032 lithium button cell;Dimensions (folded): approx. 50 x 40 x 30 mm; weight: 21 g;