The 4098-9792 Simplex is an addressable Standard Sensor Base. Therefore, compatible with a variety of TrueAlarm Detector Heads.This sensor base contains essential addressable electronics, which constantly monitor the status of the adjustable photoelectric or heat sensors. Every four seconds, each sensor’s output is transmitted to the fire alarm control panel.Automatic identification provides default sensitivity when substituting sensor types.Red LED light for power-on (pulsing) or alarm or trouble (steady on).Locking anti-tamper design mounts on standard outlet box.Magnetically operated functional test. The address remains with its programmed location.It is accessible from the front, with DIP switch under the sensor.Since TrueAlarm sensors use the same base, different sensor types can be used with 4098-9792, to meet specific requirements. The 4098-9792 Simplex sensor base also allows intentional sensor substitution during building construction. When conditions are temporarily dusty, f or instance, you don’t need to cover the smoke sensors, disabling them.In this case, heat sensors may be installed without the need to reprogram the control panel. Even if the control panel indicates an incorrect sensor type, the heat sensor will operate at a default sensitivity. As a result, you will have heat detection for building protection at that location.Mounting Requirements: 4 octagonal or 4 square box, 1-12 min. depth; or single gang box, 2 min. depth. This is a photoelectric smoke sensor. This is a photoelectric smoke sensor. This is a heat sensor.4098-9778 This is a heat sensor.4098-9734 This is a high-temperature heat sensor. This is an adapter plate.If you need more details, you can .And if you are looking for another Simplex part, you can see .