Vintage Peavey EQ-27 1/3 octave, 27-band Graphic Equalizer has on and off switch (front) bypass switch (front). Has single rotary knob LEVEL adjustment (front). This unit is rack mountable. Has some cosmetic scuffs and wear, but functions well. On/Off switch is broken off, but I used it in a rack with a power strip so it wasn't an issue. Used only occasionally in a private rehearsal space.