Manufacturer Name: System Sensor Product Number: RTS151KEY OEM Part Number: RTS151KEY Product Description: Remote Test Station With Key Weight:0.45lbs/204.12g The System Sensor RTS151KEY Remote Test Station with Key is a safety accessory designed for testing duct and beam smoke detectors in HVAC systems. This wall-mounted device, measuring 2.75 inches wide, 4.6 inches high, and... https://www.partshnc.com/rts151key-system-sensor-remote-test-station-with-key