No need to worry about faulty batteries with the Kidde i0910 10-Year Sealed Lithium Battery-Operated Smoke Alarm. This worry-free alarm contains a sealed-in lithium power supply that lasts the lifetime of the unit. Dependable and easy to install, this no-maintenance alarm saves on labor and battery costs over its lifetime. Save up to $60 in Battery Replacement Costs This worry-free smoke alarm can save you a lot of time and money over its lifetime (an estimated $60 over the 10 year life of the alarm). This alarm can save you--and the local landfill--from the cost, hassle, and waste of lots of batteries. This smoke alarm is also a great choice for hallways and high ceilings, where changing batteries can be especially difficult. Never Replace a Battery Again. View the 10-year worry-free smoke alarm. i4618 Never change a battery again. The Kidde Sealed Lithium Smoke Alarm saves you up to $60 and eliminates battery replacement hassles. Product Highlights No battery replacement for the lifetime of the alarm Powered by a tamper-free sealed lithium power supply Self-Activation automatically activates unit when attached to bracket Smart Hush silences alarm in non emergencies Money-saving alarm is great for homes and rental properties This alarm uses ionization sensing technology for the smoke alarm. Ionization sensing alarms may detect invisible fire particles (associated with flaming fires) sooner than photoelectric alarms. Photoelectric sensing alarms may detect visible particles (associated with smoldering fires) sooner than ionization alarms. Kidde strongly recommends that both ionization and photoelectric smoke alarms be installed to help insure maximum detection of the various types of fire that can occur within the home. Great for Homes and Rental Properties This tamper-free alarm prevents battery or alarm removal, eliminating worry about unauthorized battery removal or unauthorized deactivation of the alarm. Also, this alarm is a good choice for rental properties and high-density dwellings, as its sealed tamper-free design prevents theft, while also reducing labor and material costs. This helps to ensure that the property and inhabitants are protected by a fully operational alarm. Easy to Install with Self Activation The innovative automatic activation of this alarm is unlike any other smoke alarm design. The alarm will automatically activate when it is attached to the mounting bracket; there are no pull tabs and no switches--everything is automatic. At the end of the alarm life, the unit will chirp, indicating the alarm is in need of replacement. You can use a simple tool, such as a screwdriver, to deactivate the unit, stopping the low-battery chirp and making the alarm safe for disposal. The sealed-in board-mounted batteries will power the unit for its complete 10-year life. No replacement batteries will ever be needed. Trademarked Hush Feature for Convenience By pressing the smoke alarm's Hush button, you can easily and safely silence nuisance alarms caused by non-emergency situations, such as overcooked dinners. This alarm's Smart Hush feature has the capability of temporarily desensitizing the alarm circuit for up to eight minutes. This feature is to be used only when a known alarm condition, such as smoke from cooking, activates the alarm. The smoke alarm is desensitized by pushing the Test/Hush button on the smoke alarm cover. If the smoke is not too dense, the alarm will silence immediately. The red LED will illuminate for 1.5 seconds every eight seconds while in Hush mode. This indicates that the alarm is in a temporarily desensitized condition. Additionally, the smoke alarm will automatically reset after approximately eight minutes and sound the alarm if particles of combustion are still present. Smart Hush can be used repeatedly until the air has been cleared of the condition causing the alarm. Pushing the Test/Hush button on the alarm will end the hush period. Power Outage Protection, Indicator LED, and Test Feature A 10-year sealed lithium battery powers this alarm, providing continuous protection against smoke and fire hazards even during power outages. Because a smoke alarm only helps protect you if it's working, this unit features a red LED that flashes every 40 to 45 seconds to indicate that it is operating correctly. For additional peace of mind, the alarm contains a Test/Reset button that enables you to periodically test its circuitry and horn. The unit measures just 5.6 inches in diameter and 1.5 inches in depth, and it features a neutral, white finish. This smoke alarm is UL listed, so you can be confident of its quality, and it is backed by a 10-year limited warranty. About Kidde: A UTC Fire & Security Brand Renowned for global leadership in fire detection and suppression, Kidde provides solutions ranging from portable fire extinguishers to advanced industrial controls, such as flame detection and explosion-suppression systems. Kidde is a UTC Fire & Security brand, with a history that's rich with innovations, from the patent of the Chubb Detector Lock in 1818 to the development of the world's first wireless networked smoke detectors in 2004. What's in the Box Kidde i0910 10-Year Sealed Lithium Battery-Operated Smoke Alarm with mounting bracket and hardware, 10-year limited warranty, and bilingual user's manual.