Professional guitar Guitar Equalizer Phase and volume control With Volume, Bass, Middle, Treble control knobs LCD Tuner system, digital procedding tuner system Powered by 6F22 9V battery(not Include) Phase Reverse Switch Automatic low Battery check LED Mode: 3 band and EQ with tuner model:-17B Colour:black Material:plastic Package Contents: 3 * Guitar Pickup Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.