A carbon monoxide detector increases home security. The Fibaro CO Sensor HomeKit detects the carbon monoxide content in the home. In the event of danger, the detector issues a warning with a loud audible signal of 85 dB. This detector works with Apple HomeKit (from the iOS 10.1 operating system) and with the Fibaro app. The apps send a push message in the event of a threat. This way, wherever you are, you keep an eye on home security. Without an app, this detector works like a regular carbon monoxide detector. You will therefore hear an alarm signal. The carbon monoxide detector works on 1 CR123A 3V battery and this is supplied as standard.