Welcome, you are looking at a great piece. This is the Electro-Harmonix Stereo Electric Mistress Effect Pedal. With the famous flanger/chorus tone from the Electric Mistress, this pedal now adds stereo capabilities with 2 independent outputs for better tone. Chorus and Flanger can be controlled independently to create a huge array of sounds. The 'Filter Matrix' mode allows you to manually sweep the flanger or keep the flanger at one point to "freeze" your flanger tone. With so much adjustability it is easy to go from subtle flanger/chorus tones to super wet modulation sounds. This pedal also comes with the power supply so you are ready to play as soon as it arrives! We are an authorized Electro-Harmonix dealer. Don't pass this by!