Walmart has the Kidde Carbon Monoxide Alarm (21025759) for $5 with free in-store pickup or $ 5.99 shipping to home. List price: $29. It rings a loud 85 decibel sound when it detects gas. This plug-in carbon monoxide alarm can be set up in either horizontally- or vertically-oriented outlets.

$15 Shop Now

Walmart has the Kidde Carbon Monoxide Alarm (21025759) for $5 with free in-store pickup or $ 5.99 shipping to home. List price: $29. It rings a loud 85 decibel sound when it detects gas. This plug-in carbon monoxide alarm can be set up in either horizontally- or vertically-oriented outlets.

$15

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