1Sale offers Kidde AC Carbon Monoxide Detector Alarm | Plug-In with Battery Backup | Model KN-COP-DP2 for $19.47 (orig. $29.99) +Free Shipping

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•  Tamper resist feature – Can be activated to cause unit to go into alarm if it has been unplugged or has come loose from the outlet
• 2 LED’s: Red - Illuminates when in alarm mode. Green – AC power is present, normal operation
• Test/reset button: Tests CO alarm circuit operation and allows you to immediately silence the alarm
• End of life alarm: Alerts user to replace CO alarm after 10-years of operation
• Provides peace of mind against the silent killer; Temperature range: 40˚F (4.4˚C) to 100˚F (37.8˚C)