This is a compact wah pedal that uses an optical sensor. It has a cute purple color scheme and is almost the same size as a BOSS pedal. I acquired another wah pedal around the same time, so this one is unused and only the pedal itself is available, without the original box. I used a similar product before, and it has a thick, great sound. It's easy to step on for its size, making it perfect for those who want to keep their gear compact.