The EFA Kit automates focusing, temperature monitoring, control of accessories and control of fans. The kit comes complete with a 12VDC servo motor, motor mounting bracket and a set of bevel gears. The electronics are integrated in the back plate of the CDK17 and CDK20 and for the CDK12.5 comes in its own box which is mounted to the back plate of the telescope. The EFA Kit plugs into the temperature sensors and fan control wires that come standard with each telescope. A Celestron Hand Control is provided with customized software to control the Focuser, the fans, and to read out the temperature of the ambient sensor and the mirror sensor. The EFA kit comes with PWI Focus, a software package that controls the focuser from a PC. All the cables are provided to attach the EFA kit to a PC. The EFA kit is ASCOM compatible.