Orion AccuFocus for Dual-Speed Crayford Focuser & Bracket Use the pushbutton hand controller for smooth, precise focusing without vibration, even at high magnifications Choose speeds from coarse to very fine with the speed knob on the focuser controller Package includes Accufocus motor and specialty bracket for use with Orion Low-Profile Dual-Speed Crayford focuser model 8881 (not compatible with focuser model 13030) Powered by one 9-volt battery (included); also includes bracket, hardware, and coil cable Compatible with 2" Low-Profile Dual Speed Crayford Focuser and 6" Newtonian Imaging OTA