Kidde KN-COPP-LPM Battery-Operated Carbon Monoxide Alarm with Digital Display for $16.20

Kidde KN-COPP-LPM Battery-Operated Carbon Monoxide Alarm with Digital Display for $16.20.  The discounted price is shown at checkout.  Shipping is free on orders over $35.  If needed, use this Filler Tool to qualify for free shipping.  Here is a screenshot for your reference. This alarm measures the exposure to carbon monoxide over time.