This is a superb piece of technology, designed with for your guitar and your bass guitar in mind. This is a portable tuner which works by the pick up conecting to the tuner. It is powered by 2 x AAA batteries (supplied) and will work tuning chromatically, your guitar or your bass. The tuning range is A2 (27.5Hz)~a3(1760Hz). The tuning accuracy is+/-3 cents with the A4 frequency being: 435~445Hz. The volume is 96(H) x 59 (W) x 16(D)mm and the weight is only 70g. All in all an ideal tuner for you to purchase