Smart Contact SensorYour Windows & Doors Safeguard - Real-Time Monitor- Instant Notification- Smart Automation- Versatile Uses- Easy SetupKnow the StatusStop wondering if you closed all your windows after leaving home. Check on your doors and windows at a glance with the Tapo app.Turn Lights On AutomaticallySet your Smart Contact Sensor to trigger on the lights when you open your door.Go Beyond Just Doors and WindowsPlace the Smart Contact Sensor elsewhere like your cabinets and drawers for more convenience.Instant Push NotificationsReceive instant alerts on your phone when a door or window is opened unexpectedly. The Hub can sound a siren to warn of danger and deter intruders.Long-Lasting Performance2-year battery life provides long-lasting convenience.* Receive notifications from the Tapo app when the batteries are low and need changing.Easy InstallationPlace it wherever you need with our tool-less installation. The gap between the sensor and magnet (up to 15 mm) fits most doors. win