Leviton WSSLT-10 SLT Circuit Interlock Transmitter, 120VAC, White Easy-to-use: Run zero switch-leg wires Reliable range: Unique ID of each SLT activates only the intended Receiver(s) Saves energy: Conserves energy and saves money by using the SLT in load shedding or energy efficient HVAC control applications Connects HVAC, lighting, or other devices to a Relay Receiver to turn them OFF and ON automatically in sync with any device connected to an SLT Simple wireless control: Economy HVAC controls, interlocked motor controls, and secondary circuit follows power status of primary circuit