NC (switch on the magnet when it is close to the magnet)Switch: refers to the normally closed switch and the magnet on the switch is closed together, separated from the switch and the magnet when the switch is off. The magnetic switch normally open switch and the magnet means together when the switch is off, separate the switch and the magnet when the switch is closed.Appearance size: 27*14*7.6mmAction distance: 18mm + 6mmSwitching voltage: 100VDCLoad current: 300mALife: 1 million timesSwitch output: normally closed (normally closed is a magnet and band line part of the signal is closed, the separation is the line number off)Installed, suitable for non iron door or window surface installation