... protect,Small cubage,Setting convenience,Steady Capability ,Resist power supply reverse-connect,resist static,electromagnetism compatible,vibration ... power inside the device will supply power, and send an alarm to surveillance center to ask for solve the problem, driver ... reverse connection feature:≥80VWorking current:average 110mA @ DC 12V;power save status45mA @ DC 12VPower:Working status 1.2w; ...