Replacement EQ unit & magnetic pickup bar for pre-2013 versions of the Oscar Schmidt OS45CE (our #OS45CEQ), OS150FCE and others. On-board controls are 4 EQ sliders (lo, mid, high & presence), volume knob & low battery light. Powered by 9v battery (not included). Output jack & battery compartment not included. No installation instructions available. NOTE: Not recommended for installation on other autoharps. INSTALLATION OF THIS PICKUP WILL VOID THE WARRANTY ON ANY NEW AUTOHARP BECAUSE IT REQUIRES EXTENSIVE ROUTING OF THE BODY.