1.Used for locking door,drawer,sell-machine,storage shelf,file cabinet and etc 2.The lock works as the circuits disconnects,and it will as the instant power-on 3.Small size,light weight,sensitive response,simple control,saving energy and electricity 4.Unique design,easy to install,convenient disassembly 5.The red and black wires are the power cables of the electromagnetic lock,regardless of the positive and negative poles