Wireless Interface: RF Wireless 433 MHz Suitable for: Door Maximum outdoor range: 200 m Alkaline CR123A White Door ContactNotifies you when someone opens your door or window.*It must be paired with the Imou Alarm Station.Alarm NotificationsThe Alarm Station will ring a local security siren and send an instant alert to your smartphone whenever the motion is detected, keeping you aware of what's going on at home from anywhere.Smart Connection with Imou CameraSee what's happening on the Imou Life app when the detector is triggered.100% Wire-freePowered by a battery and connected via Airfly*, the Door Contact can be placed anywhere you want. * Smart linkage with Imou alarm detectors and the Alarm StationLow Power ConsumptionPowered by a CR123A battery which lasts up to three years. * Frequent alerts may accelerate the battery consumption. Real service life depends on the actual situation.Easy to InstallThe split design makes it easy to install on a door or window, and it also has mounting