The Advanced Starter Kit includes two (2) single-rocker dimmers, one (1) single rocker dimmer with 4-button multi-scene controller plus Computer Interface Module (CIM). CIM enables lighting control and automation expansion to your entire home - add additional dimmers, multi-scene controllers, lamp or appliance modules. Also includes a phase coupler. Choose 1 of 3 available options; wire-in, breaker panel-mount, or plug-in dryer. Breaker panel-mount phase coupler fits most standard power centers including GE, Cutler-Hammer, Square D, and Murray.