Scorpion HX Speed Controller
The Robot Power Scorpion HX is a flexible high-performance 3 channel speed controller for 1 lb. (ant weight), 3 lb (beetle weigth) and larger robots. It is designed for ant and beetle weight combat robots, sumo robots, and other small robots such as firefighting robots, maze solvers and carpet rovers

Scorpion XL Speed Controller
The Robot Power Scorpion XL is a perfect solution for those robots in the 1 to 12 pound classes.

Scorpion XXL Speed Controller
The next step up from the Scorpion XL, this controller has a higher-current handling.