The First Alarm Homekit Smoke and Carbon Monoxide Detector are offered by Amazon for $82.33. This First Alert hardwired alarm enables both smoke and carbon monoxide to monitor the presence and integrates HomeKit and Alexa. Moreover, Onelink can also monitor and report on its activity, if there are any other alerts in your home. 4/5 star rating.
There are many ways to collect a smoke and carbon monoxide detector for those who do not need HomeKit support. The Z-Wave model from First Alert is only $37 in Amazon and will still deliver alerts to the smartphone and so on.
SMOKE + CO DETECTION 2-in-1 smart smoke and carbon monoxide alarm alerts you to both types of danger in your home, with a photoelectric smoke sensor and electrochemical carbon monoxide sensor
MOBILE + VOICE ALERTS Alarm sends emergency notifications, via your phone, while voice alerts tell you the type and location of danger
A HOME SAFETY NETWORK + ALEXA Interconnects with existing traditional hardwired alarms and other Onelink devices (sold separately) to create a smart home safety network, so if one alarm sounds, they all sound; works with Amazon Alexa so you can ask Alexa to check the status of your Onelink alarm (Alexa device sold separately).
HARDWIRED + BATTERY BACKUP Hardwired alarm includes a 10-year sealed battery backup for protection in power outages; for maximum protection, hardwired alarms should be installed on every level of the home and inside each sleeping area
COMPATIBILITY Compatible with Apple HomeKit; can be used on both Apple and Android devices
INTERCONNECTIVITY: Unlike other smart combo alarms, Onelink can connect with any other hardwired alarms in your home (including First Alert and non-First Alert brands), and can send a mobile notification for any detected emergency, keeping your whole home safe and connected