System Sensor provides flexibility with a variety of accessories for notification and test purposes. The smoke detector accessories add functionality to the detection system by allowing quick eye level inspections and audible/visual notification options. All System Sensor accessories are UL listed. APA151: The APA151 piezo annunciator provides an audible alarm signal and LED for alarm and status indication. The unit is designed for applications without a system control panel to comply with NFPA 90 A. MHR/MHW: The MHR and MHW mini horns feature temporal or continuous tones at high or low volume settings. Designed for small or tight areas, the unit mounts to a single gang back box. RA100Z: The RA100Z remote annunciators are designed for both conventional and intelligent applications. A red LED provides visual indication of an alarm condition. RTS151/RTS151KEY: The RTS151 and RTS151KEY remote test stations are automatic fire detector accessories designed to test duct smoke detectors from a convenient location. The RTS151 features a multi-colored LED that alternates between steady green and red for four-wire detectors and illuminates red to indicate alarm when used with two-wire detectors. RTS2/RTS2-AOS: The RTS2 and RTS2-AOS multi-signaling accessories are designed to work with four-wire conventional smoke detectors. The units feature a key switch that can be used to select one of two connected sensors to be tested, reset, or both by a push button switch.