Volume control Bass, Middle and Treble control knobs. Built-in tuner with LED display. This onboard preamp system is designed and built to offer maximum control, performance and quality in a small, unobtrusive format. The compact sophisticated system features volume, bass, middle and treble controls, a phase switch, and a built-in tuner with LED display. It also includes a pre-wired pickup for solder-free, plug and play installation, a low battery indicator. Low profile control knobs and a unique pivot design for easy access to the battery compartment. Small footprint fits many guitars. It has Phase switch. Low battery indicator as well. Unique pivot design for instant 9-Volt battery access. Pre-wired pickup for easy, solder-free installation. Low profile control knobs. Onboard anti-feedback control (Notch). Brilliance control for additional tone shaping. Pre-wired endpin jack included.