Ajax FireProtect Plus Smoke, Heat and Carbon Monoxide Sensor
Wireless smoke, heat, and carbon monoxide detector with sounder.
This can be mounted on the ceiling and configured to detect smoke, heat and carbon monoxide. The app allows smoke detection to be disabled, enabling this to be fitted in areas likely to be dusty or smokey, e.g. a kitchen or garage.
Being a plus model, this provides detection against carbon monoxide - a deadly gas produced by a faulty gas appliance e.g. a boiler or a fireplace.
A built in siren produces a loud, distinctive tone to wake people up if the alarm activates.