Kidde 10-year Battery Digital Carbon Monoxide Alarm: * Sealed long life Battery alarm is warranted to provide your home with 10-years of worry-free protection * Digital readout from 30-999 PPM provides continuous monitoring of carbon-monoxide levels * Battery Powered alarm provides protection even during a power outage * Peak Level Memory notifies of a carbon-monoxide event in the last 14 days * Test-reset button allows you to immediately test alarm electronics * 10 year limited warranty on alarm * Loud 85-decibel alarm