Sophisticated onboard preamp system for electro-acoustic guitar that is designed to offer maximum control, performance and quality in a small, unobtrusive format. It features Volume, Bass, Mid and Treble controls, a Phase switch, an onboard anti-feedback control (notch), a Brilliance control for additional tone shaping and a built-in tuner with LED display. It also includes a pre-wired Fishman Sonicore pickup for solder-free, plug and play installation, as well as a low battery indicator, low profile control knobs, and a unique pivot design for easy access to the 9V battery compartment. Battery life: 88 hours. Dimensions: 55.8 x 84.2 mm.