Welcome, you are looking at a really cool piece. This is the Pigtronix Quantum Time Modulation pedal! This incredible pedal uses a pair of bucket brigade chips in parallel to stretches modulation like you've never heard before. With both an LFO controllable by the speed knob, and the envelope controllable by the sensitivity knob, you can blend these effects together with the source knob. This allows you to use one at a time or blend both for wild effects. The switch in the middle allows you to switch between 'Chorus' and 'Vibe'. Chorus blends in clean signal for more of a natural sounding chorus tone whereas the Vibe setting only uses the wet signal. Overall, it is an incredibly diverse pedal that lets you blend and create many different sounds for your guitar! Like many other Pigtronix pedals, this pedal can work with a 9V power adaptor, but ships with an 18V adaptor for better headroom, clarity, and output! We are an authorized Pigtronix dealer! Don't pass this by!