Easy Install Connect in minutes No Hub Required Plug & play 2.4GHz Wi-Fi Easy wireless operation Batteries Powered Batteries included (AAA x 2) Mobile Alerts Always stay in touch with push notifications when activity is detected Multi-Purpose Use Perfect for doors, windows Smartphone Control Control using the app Add a Siren for Audible Alerts Add sensors, siren, cameras & more Complete Peace of Mind Always know what's happening & be protected with this window or door alarm sensor to trigger mobile phone notifications & optional siren. Easy to Use If a door or window is opened, disrupting the magnetic connection between the Sensor & Receiver, you can activate/deactivate remotely using the app. Perfect for Renters Do-it-yourself with ease. The sensor mounts with double-sided adhesive. No need to drill walls. Ideal for apartments & rental properties. More than an Alarm Combine with an add-on Indoor Siren (sold separately) for audible alerts to know if there’s activity even if your phone’s not handy. Build Your Own Security Connect on the Swann Security app & add additional Swann Wi-Fi sensors, siren, cameras & accessories to fit any home, apartment or business for complete security.