The Universal Security Instruments Hardwired MIC1509S 3-in-1 Smoke, Fire and Carbon Monoxide Smart Alarm provides 10-years of continuous protection against 3 deadly threats within the home. New patented Universal Smoke Sensing Technology offers 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. The ideal addition for new or replacement installations, this maintenance-free alarm is suitable for houses, apartments and mobile homes in every room. This USI Combination Alarm utilizes a sealed back-up battery (included) that will never have to be replaced throughout the life of the alarm, giving you a decade's worth in peace of mind even in the event of a power outage.

• 3-in-1 smart alarm provides 10-years of continuous protection against fast flaming fires, slow smoldering fires and carbon monoxide
• Sealed battery (included) will never have to be replaced throughout the life of the alarm
• Features microprocessor intelligence to virtually eliminate nuisance alarms
• Conforms to UL217 and UL2034 standards
• California state fire marshal approved