Window/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. Package ContentsTapo T110Quick Start GuideBattery CR2032 x 13M adhensive