.* Small compact size; 360-degree rotation capability.* This will be good options to keep your instrument in tune.* 5 modes of operation of the main instruments - Bass, Violin, Guitar, Ukulele and Guitar 27.5Hz to 4186Hz for maximum tuning precision.* Simple one-button operation. Simply click a button to switch modes and power.* Brilliant LCD screen changes color when you're in the sweet spot.* Heavy duty clip is easy on instruments, but esnures this tuner goes nowhere. Specification: Suitable for: Guitar, Bass, Violin, Ukulele, Oud, Cello, ViolaetPower: CR2032 Battery 1 Piece (Included)Color: BlackMOdel: AT-01AMatest: SiliconeWeight: 20g (Approx)Package Included:List 1: 1 x Tuners + 1 x Battery (CR2032)List 2: 2 x Tuners + 2 x Battery (CR2032)List 3: 4 x Tuners + 4 x Battery (CR2032)