Roost-- the company behind a smart battery for smoke detectors-- takes on the actual device category with the RSA-200 and RSA-400, a pair of connected smoke detectors similar to the Nest Protect.
The RSA-200 features smoke and fire detection, while the RSA-400 adds carbon monoxide and natural gas detection. Both are based on the aforementioned Roost smart battery for internet capabilities, providing customers with smartphone notifications in case of alarms.