Basically dude, it's a way of making the drums sound totally different, almost electronic. It makes them sound alot more clean, but alot less authentic in my opinion. Kind of a cheap sound. There's little clamps that go on the rims of the drum and they sit up against the head. From there, they run into a drum brain which is kind of like a preamp, or a way of controlling the sound of the drums which the clamps pick up and send to the brain. It's pretty fucking much exactly like an electric drumset. The only difference is you're making actual acoustic drums go through the brain.