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The technology behind it involves using a radioactive isotope of americium usually, it’s Americium 241 to ionize the air inside a chamber and, if the sensor detects any changes in the air, it triggers the alarm.Flood Sensor
Skip the hassle that comes with hard wiring an electric doorbell camera with RemoBell by Olive and Dove. The device runs on AA batteries, so there's no messing with wires in your exterior wall when connecting. To install, set up the smartphone app and mount the device on any vertical surface using the enclosed screws. You'll get a push notification and live video feed when anyone rings the bell or activates the motion sensor. Afterward, you can interact with who's there via two way audio. You'll also be able to look at the recorded video later without paying for cloud storage.