The company's lighting interface modules are designed to allow users to switch to Douglas ‘HID' or General Electric ‘RR' series relays directly from its MACH-System universal outputs. Each module supports two inputs and outputs. Separate modules are available for Douglas and GE systems. Features include a 12V signal, a 24 VAC pulse to the latching relay of the system (both on and off), and no external power supply is required.