First Alert announced at CES 2015 that they’re releasing a whole series of smart home connected devices, like a thermostat, camera, wearable and low level CO+environment sensor. The smokes use Photoelectric sensors 
and can wirelessly interconnect with each other, like the Nest Protect. So far they only interface with iOS devices, but they’re an Developing apps and accessories for the home - Apple Developer Apple HomeKit partner, and an open API is available for other smart home platform developers.
http://www.firstalert.com/onelink
