This is the device that detects smoke/carbon monoxide and provides alerts while you are away as well as at home. It also is enabled with Alexa, so you can issue voice commands, have questions answered, and play music, weather, and news. It works with an existing home wireless Internet connection and can be accessed via a iOS or Android smartphone app. Just like a conventional smoke/carbon monoxide detector, it issues an 85 dB alarm in a home but it also sends a warning to your smartphone anywhere in the world. Installs into an existing ceiling mount with existing wiring. 6 3/4" L x 6 3/4" W x 2 1/4" D. (1 1/2 lbs.)