Plug-In Carbon Monoxide Detector with AA Battery BackupKidde AC DC carbon monoxide alarm plugs directly into your home's standard wall outlet. The AA battery backup provides protection even during power outages when many CO incidences occur. Tamper resist feature deters tampering or theft of the unit. Tamper resistant Battery backup Hush feature 5 year limited warranty AA battery backup provides protection during power outages *Check with your state and local fire and Building Safety codes for specific