Kidde Carbon Monoxide Detector, Plug in Wall with AA Battery Backup, Test-Hush Button & Hardwired Smoke Detector with Safety Light, 9-Volt Battery Backup, Ideal for HallwaysBrand: Kidde Features: Product 1: Easy Installation simply plug in to a standard, 120V outlet in your home Product 1: 2 AA battery backup provides protection during a power outage Product 1: 85 decibel alarm announces when carbon monoxide is detected Product 1: Peak Level Memory records the last time carbon monoxide was detected or when the unit was last tested Product 2: Ionization sensor technology alerts to invisible fire particles to provide