The Kidde PI9010 Battery-Operated Dual Sensor Smoke Alarm combines photoelectric and ionization sensing technologies into one unit to offer broad detection against smoldering and flaming fires. Experts recommend that for optimal protection you have both types of sensing technology in your home. This smoke alarm's trademarked Hush feature allows you to silence nuisance alarms, while an indicator LED and test feature let you easily confirm that the alarm is working. The Kidde PI9010 Battery-Operated Smoke Alarm: Employs both photoelectric and ionization sensors. Features a hush button to silence the alarm for non-emergency situations like a smoky dinner. Compact design blends in seamlessly with your home decor. Stand-alone battery operated alarm is easy to install throughout the home, as no wiring is needed. With two different sensors, you'll get warnings sooner no matter the kind of fire. View larger. Be assured of your home's safety with the PI9010 smoke alarm. View larger. Dual-Sensor Technology for Improved Safety Experts divide home fires into two groups: flaming and smoldering. Flaming fires result from flammable liquids and cooking accidents, while smoldering fires most often occur when smoking materials, such as cigarettes, are left unattended. Ionization smoke sensors may detect smaller, less visible fire particles, like those produced by flaming fires, sooner than photoelectric sensors. However, photoelectric sensors are may detect larger, more visible fire particles, such as those produced by smoldering fires, sooner than ionization sensors. Each must pass identical performance standards to obtain third-party approval and meet Underwriters Laboratories (UL) 217, the independent standard to which alarms are listed. Because you don't know what type of fire you will have in your home, experts recommend installing both types of technology for optimal protection. Experts Recommend Protection from Both Types of Fires Virtually every recognized fire authority recommends the installation of both ionization and photoelectric alarms in order to maximize protection from either flaming or smoldering fires. Kidde offers photoelectric smoke alarms, ionization smoke alarms, and dual sensor alarms, which combine both technologies in one unit. Regardless of the technology, the most important thing is to ensure that you have working smoke alarms on every floor of your home, inside each bedroom and outside sleeping areas. Studies show placing alarms in both bedrooms and hallways could increase a family's escape time by up to 15 minutes. Fire Authorities recommending both smoke alarm technologies: National Fire Protection Association (NFPA) International Association of Fire Chiefs (IAFC) U.S. Fire Administration (USFA), the National Institute of Standards and Technology (NIST) Consumer Product Safety Commission (CPSC) Consumer Reports National Association of State Fire Marshals (NASFM) Underwriters Laboratory (UL) Trademarked Hush Feature for Convenience By pressing the Hush button, you can easily and safely silence nuisance alarms caused by non-emergency situations, such as overcooked dinners. This feature desensitizes the alarm for approximately seven minutes. During this time, the alarm chirps every 30 to 40 seconds. If the smoke is too dense, the Hush feature is overridden and the alarm still sounds, and the alarm automatically resets at the end of the seven minutes. This convenient safety measure eliminates the temptation to remove the alarm's battery, which creates an unsafe situation. Reliable 9-Volt Battery Power, Indicator LED, and Test Feature Because a smoke alarm only helps protect you if it's working, this unit features a red LED that flashes every 30 to 40 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. A standard 9-volt battery powers this alarm, which provides continuous protection against smoke and fire hazards even during power outages. The unit offers a low battery warning that issues a brief chirp every 30 to 40 seconds for at least seven days before losing power, letting you know it's time to change the battery. The unit measures just 5.75 inches in diameter and 1.8 inches deep, and it features a neutral, white finish. It features tamper resist features to deter vandalism or theft. This dual-sensor 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 Dual Sensor photoelectric/ionization smoke alarm with mounting bracket and mounting hardware, 9-volt battery, 10-year limited warranty, and bilingual user's manual. The Kidde PI9010 is a breeze to operate and has a hush feature to temporarily silence alarms.