Protect your home against intruders with the Feit Electric MOT/DOOR/WIFI/BAT smart door and window sensor. Operating on two replaceable AAA batteries, this compact sensor mounts on door and window frames and uses the free Feit Electric app to notify your smart device whenever it senses an opening or closing. No hub required. Keep track of your home activity from anywhere and know if you’ve left your doors or windows open. Use a smart sensor on doors and windows in your home, garage, retail store, or travel trailer for peace of mind at night and when you’re away. The sensor can be installed with the included mounting screws or mounting tape. A 2.4GHz network is required for Wi-Fi setup. Get 24/7 protection, even when you're far from home.