Hop over to Amazon and get a deal on X-Sense Carbon Monoxide Detector Alarm. Displays real-time CO levels and remembers dangerous CO levels since the last preset. An early warning will be delivered through a loud 85-decibel alarm. Clip the 30% off coupon to drop the price. This is a great deal, compared to $30 … Continue reading X-Sense Carbon Monoxide Detector Alarm $20.29 After Coupon (Reg. $29)