The Shadow SH PERF-T combines a preamp with an integrated chromatic tuner and a Nanoflex pickup. The onboard mounted control panel features volume, bass and treble controls so you can adjust your tone easily. The Phase switch inverts the signal to help combat feedback in live PA settings. SH Performer Tuner is completely shielded hum-free. It comes with an active Nanoflex pickup and a high quality endpin connection. The 9V battery is easily accessible on the control panel. Outer bezel dimensions: 64,5mm x 56mm (2.5 x 2.2 inch) Cutout dimensions: 44mm x 47mm (1.7 x 1.9 inch)