Okay - so first thing is - this deal is at Costco so it's not for everyone obviously but most people probably know someone with a Costco card.
However - secondly - this is a really great deal for combined smoke and carbon monoxide alarm from Kidde - model number is KN-COSM-B-UK. Costco currently have £5 off their normal price so it's £11.98 (including VAT) and comes with a 10 year warranty.
So this is only £2 more than the Kidde Carbon Monoxide alarm deal at Argos that was posted on here two days ago but you're getting a smoke alarm as well - BARGAIN! Please note that the £5 off deal expires at the end of this weekend (14/05/2017).
Smoke Alarm Benefits:
> Eliminates confusion: voice system states "FIRE! FIRE! accompanied by loud 85 decibel alarm alerting you when smoke/fire is detected.
> Proven detection: permanent state of the art ionisation sensor.
> Test/Reset button allows you to test and reset both Smoke and CO sensor's circuits.
Carbon Monoxide Alarm Benefits:
> Eliminates confusion: voice system states "WARNING! CARBON MONOXIDE!" accompanied by loud 85 decibel alarm alerting you when CO levels become dangerous.
> Peak level memory: Alarm alerts you if CO levels (above 100 ppm) were detected while you were away.
> Proven detection: advanced carbon monoxide sensor technology.
>No sensor replacement needed.