The Universal Security Instruments MCD305SB Carbon Monoxide Smart Alarm provides 10-years of continuous protection against the silent killer - carbon monoxide. Perfect for new or replacement installations， this maintenance-free alarm is suitable for houses， apartments and mobile homes in every room. The sealed battery (included) will never have to be replaced throughout the life of the alarm， giving you a decade of peace of mind even in the event of a power outage. Permanent Power also saves money from battery replacements (up to $38.00 over the 10-year life of the alarm)， eliminates annoying low battery chirps and helps the environment by reducing environmental waste from disposed batteries. This alarm features microprocessor intelligence to completely eliminate nuisance alarms， a single silence/test button to quiet a non-hazardous alarm and an end-of-service life warning that sounds when it's time to replace the battery (approximately 10-years from activation). The digital display screen is bright and easy to read with a red LED light indicating the status of power and CO. Mount this alarm on the wall or leave it standing up on a table top. Once the alarm is deactivated， the tamper resistant feature turns on to prevent deactivated alarms from being reinstalled. This alarm is UL Listed， California State Fire Marshal approved and Federal Housing Authority (FHA) approved to exceed industry standards.

Lithium-free alkaline permanent power from Duracell Duralock is safer and more eco friendly

Superior resistance to false alarms， no batteries to change， no battery chirps

Quick find alarm origination feature easily identifies originating alarm to sound

10-year product end of service life warning - sounds when it is time to replace detector

10-year limited warranty

Alarm Conforms To UL2034 Standards， California State Fire Marshal Approved and Federal Housing Authority (FHA) approved to exceed industry standards