TP-Link Tapo Smart Contact Sensor | TAPO T110Window/Door Safeguard- Monitors the opening & closing of windows, doors, cabinets, the fridge, or the mailbox in real time.Instant App Notification- Is your parcel locked away? Find out immediately with instant notifications.Smart Action Support- Connect the actions with other smart devices for a welcome return home.Easy Installation- Mount to nearly any surface with included 3M adhesive.Great Compatibility- Just one part of the integrated Tapo ecosystem.