Features: Small footprint fits many guitars Volume control Bass, Middle and Treble control knobs Built-in tuner with LED display Phase switch Low battery indicator Unique pivot design for instant 9-Volt battery access Pre-wired Fishman Sonicore pickup for easy, solder-free installation Low profile control knobs Onboard anti-feedback control (Notch) Brilliance control for additional tone shaping Built-in microphone with mic blend level control 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)Package size: 24 x 16 x 5.2cm / 9.4 x 6.3 x 2inch Package weight: 117g / 4.1oz Part. No.: PSY-301 Package Includes: 1x Fishman Onboard Preamps 1x end pin jack 4x screws 1x manual 2x mounting brackets Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.