The Universal Security Instruments MIC3510SB 3-in-1 Smoke， Fire and Carbon Monoxide Smart Alarm provides 10-years of continuous protection against deadly threats in the home. New patented Universal Smoke Sensing Technology provides the benefits of both photoelectric and ionization alarms in 1 device to protect against fast flaming and slow smoldering fires. This alarm also features protection against the silent killer - carbon monoxide - making it a 3-in-1 device. Perfect for new or replacement installations， this maintenance-free alarm is suitable for houses， apartments and mobile homes in every room. 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 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). Perfect for replacement of existing Universal Electric alarms， this unit features a large mounting base to cover imperfections in drywall and the option to replace retrofitting applications. Once the alarm is deactivated， the tamper resistant feature turns on to prevent deactivated alarms from being reinstalled. for maximum protection， install an alarm inside every bedroom， outside every sleeping area and on all levels of the dwelling.

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 in an interconnected system

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

10-year limited warranty

Alarm conforms to UL217 and UL2034 standards， California state fire marshal approved and Federal Housing Authority (FHA) approved to exceed industry standards