Smoke sensor for use with Yale smart alarm (sold separately) and Yale Home app. Developed in collaboration with FireAngel to provide the alarm with excellent smoke detection capabilities. Easy to set-up and get started using the app. Features loud 85dB siren and real-time alerts to ensure user is always notified of any fire-related emergencies within the home. Works with - Amazon Alexa - Google Home - iOS App - Android App Interlinked via Wireless 10-Year Sealed Tamperproof Lithium Integrated Battery 85dBA Alarm at 3m Test Switch Compatible with Yale Smart Alarm 85dB Siren Smart Hub Required Works with - Amazon Alexa - Google Home - iOS App - Android App Interlinked via Wireless 10-Year Sealed Tamperproof Lithium Integrated Battery 85dBA Alarm at 3m Test Switch Compatible with Yale Smart Alarm 85dB Siren Smart Hub Required