Know when someone enters your home with the Geeni Smart Door & Window sensor. Get real time alerts at the exact moment you have an unexpected guest, opened safe or escaped pet. Using your home Wi-Fi, you can set up automated actions with other Geeni Smart Home products such as automatically powering on the lights when a door is opened. This smart home door and window sensor system works with your home Wi-Fi-no hub required! Simply download the Geeni app, mount your sensors with the included adhesive or screws, and connect. The door and window sensors are battery-powered for a long-lasting performance. You can put your mind at easy knowing that the built-in CR2 battery provides continuous operation for up to 2-years. The Geeni Door and Window Sensors are only compatible with 2.4GHz Wi-Fi networks. The sensors easily install in any entryway and the wireless design offers flexible placement options.