Twist-Lock units house their proprietary, patented GPS enabled load control system which is the basis of every product they sell. Available in many voltage configurations. 3-pin (ON/OFF) and 5/7-pin (ON/OFF + Dimming) models. 4 different Dimming Protocols available. 0.4 watts average power consumption = $1/year operating cost. Instantly Installs Everywhere You Have Existing Photocontrols.