EI Electronics Carbon Monoxide Detector Ei208 W, Radio networkable with optionalRadio Module

May be a good alarm (can't say), but the one I received had a label stating that it should be replaced in 2019 (three years after purchase) despite the packaging stating it lasts for six years. So I sent it back and bought a different one from Screwfix instead.

The CO alarm arrived within a couple of days of ordering,giving us peace of mind immediately.I'd recommend using this company if you value great service.