Feature 1Efficient Alarm: Even a slight vibration can trigger the alarm, more sensitive, can be a good protection of your property and items. 2Wide Application: Wired rolling shutter door magnetic alarm can be used for different types of doors such as rolling gates and rolling shutter doors. 3Easy Installation: No need for complex circuit connection, just simple installation can be enabled, providing you with convenience. 4Strong Adsorption Force: The magnet end uses strong magnetic glue, and the induction is more sensitive. 5Anti Theft Function: Effectively prevent theft and intrusion, to protect the security of the home and the store, is a very practical tool.Item Type:Door Magnetic Contacts Switch SensorWeight: 168g/5.9ozSensing Distance :50-70mm/2-2.8inMaterial: Aluminum alloy silver gray platingSuitable for Working Voltage: 12VApplicable to Working Current: 500maContact Mode: (NC\NO) Normally closedInstallation Mode: buried, surface installationScope: Applicable to all kinds of rolling shutter doors .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 xMagneticContactSwitches4 x Screws1 x Accessory