Description This iOptron Electronic Automatic Focuser (iEAF) is designed for both Crayford and Rack-and-Pinion focusers. It is powered by a 5V USB port. The focuser is ASCOM compatible and will work with most planetarium and imaging software. It also can be adjusted manually by pressing a button on the focuser. Features: Whisper quiet operation Powerful stepper motor Zero backlash Built-in temperature sensor USB connection to a computer ASCOM compatible Manual adjustment Position memorizing during power off Compatible to most focuser with proper mounting bracket/adapter Specifications Focuser Crayford or Rack-and-Pinion focuser Driving train Stepper motor Power/Communication USB2.0 port Maximum payload 5 kg Temperature Sensor Yes (Built-in) Control ASCOM compatible or manually Focuser speed 3 rpm Dimensions 51 X 61 X 41mm Weight 254g (focuser only) Warranty One year limited