... LED ON/ OFF optional 3, Alarm output N.C./N.O. optional 4,Pet <20Kg immunity ... auto-compensation to adapt environment change• Alarm output N.C./N.O. optional to adapt different alarm systems• ... 2m• Operating temperature : -10°C~50°C(14°F~122°F)• Relay output: N.C./N.O. optional, contact rating ... 28VDC, 80mA• Anti-tamper switch: N.C. without voltage output, contact rating 28VDC,100mA• Size: ...