Vintage morely power wah-boost. Just had the pedal serviced by rick hamel of SIB pedals like the varidrive and mr echo. he repaired the light tight bellows that hide the opto. also re calibrated the until to work for the entire physical sweep of the pedal. Works perfectly. but remember to plug in and this pedal before turning on your rig. due to the it ungrounded circuit you can get a shock when holding the shielded/grounded 1/4 plug.-100 bucks shipped priority mail in the us paypal preffered.