BOSS CS-3 Compression Sustainer effects pedal in good used condition. It has Level, Tone, Attack, and Sustain controls. Works well for smoothing dynamics and adding sustain to guitar signals. I used it in a Weezer cover show to get some of their older gnarly heavy sustain guitar sounds. It can be dialed in to be fairly transparent to up to heavily audibly compressed.

The sticker and serial number came off the bottom of the pedal when I pulled the Velcro off.