Ceiling Fan Controller doesn't require a new ceiling fan; you keep your existing AC-motored fan in place. The module installs inside your fan's canopy and connects to the existing fan wiring.
Naturally, you'd expect to control fan speed with Ceiling Fan Controller. Once installed, you can cycle through Off, Low, Medium and High fan speeds.
If your ceiling fan includes built-in lighting, Ceiling Fan Controller can brighten and dim your fan's light alongside adjusting the fan speed.