Celestron CGE Computerized Mount Fully computerized, very heavy duty equatorial mount with 40,000+ object database Made from CNC-machined aluminum and stainless steel components, with 65-lb. payload capacity PEC, autoguider port, and other features make it ideal for astrophotographic applications Two made-in-USA DC servo drive motors, with dual encoders accurate to 1.5 arc-minutes Precision bronze 180-tooth worm gear and stainless steel worm shaft