The classic phaser pedal! One knob for super simple operation, and built like a tank. This one is a reissue, and has an LED which shows when the pedal is on. Originally released in 1974, this pedal has been used by countless musicians throughout various genres. This Phase 90 has scratching on the enclosure of the pedal, but functions as it should. It has velcro on the back of the pedal, and is powered by either a 9 volt power supply or 9 volt battery.