All I can say is this little machine is amazing. I bought it with plans to use it in church services but never took the time to learn to use it. It's still in the box. I can text you a video on this posting showing it in operation (be sure to enable the sound).
Essentially this machine puts a drummer in your amplifier, with all different kinds of patterns, timings and fills. It runs on three AA batteries and for practice sessions, it has a built-in speaker. A power supply and foot control are not included, but are optional. (The foot control allows you to control the machine during a performance without having to reach for it.)
The machine's in Pleasanton. There are some great tutorials on You Tube; here's a good intro: