Boss TU-05 Clip Tuner; Compact and accurate clip-on tuner with high-contrast color display; Four tuning modes (chromatic, guitar, bass, and ukulele) and built-in rechargeable battery; Auto power off feature conserves battery life when not in use; Up to 10 hours of continuous runtime; included: USB charging cable; Tuning Range: (27,5 - 4186 Hz); Reference Pitch A4 (431 - 449 Hz); Tuning Accuracy: 1 cent; Dimensions: (W x D x H) 42 x 48 x 55 mm (1,69" x 1,94" x 2,31"); Weight: (including Battery) 35 g (2 oz)