Ideal for guitar, bass, and ukulele, the clip-on TU-01 is the most affordable tuner in the trusted BOSS lineup. Small, durable, and simple to use, it provides convenient, reliable tuning right on your instrument’s headstock. A bright, attractive display features a cool digital meter and note indicator, plus two lights that show when you’re perfectly in tune. The TU-01 also adjusts for different viewing angles and folds down for easy transport in your case or gig bag. - Renowned BOSS tuning quality in an affordable clip-on tuner - Features Chromatic, Guitar, Bass, and Ukulele tuning modes - Convenient reference pitch function (A=440 Hz) - Runs for up to 25 continuous hours with a CR2032 lithium battery - Auto off function to preserve battery life when the tuner is not in use - Dimensions: 56 x 31 x 32 mm - Weight: 30 g.