Module simply snaps-in for easy installation. Can be installed with the following devices: TM811, TM813, TM833, TM818, TM838, TM8111, TM8113, TM81111 and TM8118 and the LS Series of Dimmers and Fan Speed Controls. Lights when OFF. Uses energy-efficient 1/4 watt LED light. LED light will not generate heat and will last