First Alert Hardwired Smoke and Carbon Monoxide Alarm, 3-pack | Costco
Meross Carbon Monoxide Detector/Alarm, LCD Digital Display CO Alarm with 2 AA Batteries(Include) and Silence Function, 7-Year Fire Safety for House, Bedroom, Hotel : Amazon.co.uk: DIY & Tools
First Alert 2107735 Carbon monoxide Alarm | DIY at B&Q
Professional Carbon Monoxide Test Kit/ Detector -CA101 683431991019 | eBay
10 Year Life Carbon Monoxide Alarm - Kidde K5CO - £16.61 inc VAT