This is the Celestron Astromaster Motor Drive that I used for my basic DIY timelapse rig. You can pick it up at B and H Photo for 35 bucks.
Click here to see current price and get more info.
The photo below shows the many few switches it has. Basically it only has three working switches and one light. The red led is the power light. The on and off button is labeled and N and S switches will change the direction of the motor. Below the red led you have a small knob to control the speed.