ROWIN NANO Series LN-327 TRILL Photoelectric Tremolo Tiny effect pedal - big sound! A very versatile photoelectric tremolo pedal offering a wide combination of adjustable pulsing character smooth type tremolo shaping with classic tone. Hard and normal type of tremolo, in a super small package design with a wide range of sounds, Simple to use, just choose between Hard or Normal modes using the micro two-way switch. Then use the Depth, Speed, and Color speed knobs to adjust the tremolo sound to your desire.. Compact, Tough Design This nano pedal is very small - less than 3 inches in length! Only 1.5 inches wide! With a small footprint like that, you will not have any problem finding a place on your pedal board for this pedal! Tiny doesn't mean weak - this series of effects are extremely tough! All metal construction, true bypass, and metal micro switches - this pedal is gig worthy. True Bypass Circuitry Hard to believe but these effects are designed with a 3PDT - true bypass, your tone is not altered when the pedal is not engaged. Specifications Full Metal Shell Depth/Speed/Color control Two modes – hard and normal True Bypass 3DPT Switch Power Supply: 9V DC (Negative Center) - (Not Included) (38ma). NOTE that these pedals do not run on batteries, you must use an adapter like a BOSS (or a power supply).