The System Sensor RTS2 Multi-Signaling Accessory is a remote test and indicator device designed for use with System Sensor duct smoke detectors in HVAC systems. It allows maintenance personnel to remotely test alarm functionality and visually monitor detector status without accessing the duct. The accessory operates by providing test activation and LED indication, supporting faster in... https://www.partshnc.com/rts2-system-sensor-multi-signaling-accessory