Seems a decent price, around £29.99 from Argos Also have smoke alarms for £2.99
5 Year Warranty
Protect your family from CO the invisible, odourless killer with this state-of-the-art device.
* Green light flashes at 1 minute intervals to signify unit is working
* Red light flashes and an alarm buzzes if CO is present
* Back-lit digital display (shows danger present at night, when risk is greatest)
* Advanced sensor technology * No parts or sensors to replace * Continuous self-test function
* Test/Hush button * Easy to install, wall-mounted or free-standing * BS50291 Kite Mark