Boss TU-2 Clip Tuner; Compact and accurate clip-on tuner with high-contrast color display; Four tuning modes: chromatic, guitar, bass, and ukulele; Up to 24 hours of continuous runtime with CR2032 lithium battery; Auto power off feature conserves battery life when not in use; Tuning Range: (30 - 4000 Hz); Reference Pitch A4 (430 - 450 Hz); Tuning Accuracy: 1 cent; Dimensions: (W x D x H) 28 x 38 x 50 mm (1,13" x 1,5" x 2"); Weight: (including Battery) 25 g (1 oz)