From the Firehawk W Series, this radio-interlinked home protection kit includes 2 optical smoke alarms (for living areas and circulation spaces) and 1 heat alarm (for kitchens and garages). The alarms are powered by sealed 10 year lithium batteries that will never need replacing and communicate with each other wirelessly via radio-frequency, so that all connected alarms will sound when one detects a potential fire. Additional Firehawk radio-interlink alarms can be added to the system for a total of 15 smoke, heat, and carbon monoxide alarms. All of the alarms in this kit also come with a 7 year manufacturer’s warranty for peace of mind.