Kidde KN-COPP-3 Nighthawk Plug-In Carbon Monoxide Alarm with Battery Backup and Digital Display for $31.94

Product Review Designed for residential use, the Nighthawk Carbon Monoxide detector keeps everyone in the house safe from poisonous, odorless CO fumes. The unit detects carbon monoxide levels from 30 to 999 parts per million. Its low-profile design doesn't stand out when connect to any wall outlet.