Features • Magnetic test feature makes maintenance easy and simple. • Dual LEDs for 360-degree visibility. • Detector is made of high endurance, solid and colorfast Fire-proof plastic. • 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. • 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.