The Monoprice 611220 Chromatic Pedal Tuner is a compact and lightweight pedal tuner designed for guitars and basses. With a sleek black color and dimensions of 4.3 inches in length and 2.9 inches in width, this tuner is easy to use.  It's powered by a 9-volt battery or AC adapter, neither of which are included.  This tuner worked fine for me but I replaced it with a combination pre-amp/tuner.  There is a scratch on the front of the unit.