Battery powered smoke alarm that uses an optical sensor.
eBay
CPVAN Wireless 3-in-1 Digital screen Carbon Monoxide Detector with Temperature & Humidity for Home Security Protection CO Alarm
Aliexpress UK
This essential safety bundle includes theKidde K7DCO carbon monoxide detector and theKidde 10Y29 smoke and fire alarm. Long-Lasting Performance : TheKidde K7DCO runs on replaceable AA batteries (included), while theKidde 10Y29 features a sealed 10-year lithium battery, so you won’t need to worry about replacing batteries for a decade.
eBay
HEIMAN Zigbee Carbon monoxide detector High sensitivity CO sensor suitable for Smart houses
Aliexpress UK
Easy to Install: The Kidde K5CO and 10Y29 are easy to set up, with no complicated installation required. Kidde K5CO Carbon Monoxide Detector: This compact and easy-to-install CO detector provides early warning of carbon monoxide buildup, a colorless and odorless gas that can be deadly.
eBay
Tuya WiFi Smart Carbon Monoxide Detector Alarm 85dB Sound Warning LCD Digital Display Home Indoor CO Sensor Poisoning Siren
Aliexpress UK
The Kidde Optical Alarm can be wall or ceiling mounted, and is very easy to install. The alarm features a hush button that is ideal for silencing false alarms, such as those caused by cooking or steam.
eBay
Kitchen Use Zigbee3.0 Carbon Monoxide Sensor CO Gas Detector Compatible With Deconz And Home Assistant
Aliexpress UK
Kidde KCOSAC Battery Powered 29HD Smoke Alarm & K5CO Carbon Monoxide Alarm Brand new.
eBay
Carbon Monoxide Detectors Powered By Batteries With Digital Display Alarm Sensors Easy To Install Applicable To Home Warehouse
Aliexpress UK
Kidde 10LLCO Carbon Monoxide Detector & 10Y29 Optical Smoke Alarm Special Offer.
eBay
Tuya Smart WiFi Zigbee Gas carbon monoxide Detector Multifunctional Alarm 80DB Alarm APP Wireless Control Smart Home Security
Aliexpress UK
The 10SCO has a Hush™ button to temporarily silence nuisance alarms. It also has a test/reset button to allow regular testing of the alarm function. BSI certified to EN50291-1:2010 (Carbon monoxide).
eBay
Independent CO Alarm Sensor Carbon Monoxide Alarm Detector High Sensitive Warning LCD Display CO Alarm With UL2034
Aliexpress UK
Combination Smoke and Carbon Monoxide Alarm. "Caution, carbon monoxide previously detected", as well as low battery alerts. Carbon monoxide!". Its thoughtful design allows it to fit seamlessly into any space, ensuring safety is never compromised.
eBay
Tuya WiFi Smart Carbon Monoxide Detector Alarm 85dB Sound Warning LCD Digital Display Home Indoor CO Poisoning Siren
Aliexpress UK