Swann Security - WiFi PIR Motion Sensor - 1 Pack Complete Peace of Mind - Always know what’s happening & be protected with this PIR motion-sensing alarm to trigger mobile phone notifications & optional siren. 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 phones not handy. Senses Key Movement - The Sensor detects the movement you care about - from people & can be mounted inside or outside. 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. Depth: 52 MM Easy Install - Connect in minutes Mobile Alerts - Always stay in touch with push notifications when activity is detected No Hub required - Cost-effective alerts Weatherproof - Durable casing for indoor/outdoor use with weather resistant IP66 rating Detect Motion - Wide 110 degree Motion Detection Wireless - Easy 2.4GHz Wi-Fi operation Smartphone Control - Control using the app Batteries Powered - Batteries included (AAA x 2) Add a Siren for Audible Alerts - Add sensors, siren, cameras & more Height: 16 MM Width: 66 MM