Mic Blend Dual Model Preamp EQ Tuner Piezo Pickup Beat Features: 100% New and unused. Small footprint fits many guitars. Volume Control. Control knobs and a unique pivots design for easy access to the battery compartment. Specifications: Bass, Middle and Treble control knobs; Built-in tuner with LED display; Phase switch; Size:2.20" W x 3.3" L x 1.625" D (55.8mm x 84.2mm x 41.3mm); Hole size:2.0" W x 2.662" L (50.8mm x 67.62mm); Screw spacing:1.785" W x 2.795" L (45.34mm x 71mm); Note:The battery is not included; Package List: 1* Onboard Preamps; 1* End pin jack 4x screws; 1* Manual; 1* Tags; 2* Mounting brackets