The standard detector is 2-wire or 3-wire. For 4-wire type just add one relay output module on 3-wire base.
Simple and easy module placement enables wider application and flexible stock control. Detector is made of high endurance, solid and colorfast Fire-proof plastic. Non-loosening screws on base terminal for easy installation. Detector has passed strict EMC test, which greatly eliminates false alarms caused by interference from nearby sources. Dual LEDs for 360-degree visibility. Bi-color LED, Stand-by Status: Green; Alarm Status: Red.