Update: Deal over.
Kidde Nighthawk Carbon Monoxide Detector, AC-Plug-In with Battery Backup, Digital Display – Link
This is currently marked down to its lowest ever from Amazon at only $17.97!
- Protects during a power failure – carbon monoxide alarm contains a 9V battery backup in case of plug-in failure
- Easy installation – plug can be installed in any outlet of your home; or use the attached extension cord to place on a table or shelf
- Peace of mind – when CO detection is normal, a red dot appears in the lower right corner & blinks; includes a test button
- Electrochemical sensing technology – CO alarm detects the presence of carbon monoxide gas, 85 decibel alarm & memory storage
- UL Certified, 10-year limited warranty