UL Certified with a 10-year limited manufacturer's warranty. If that date is unknown, it should be assumed that replacement is needed. Meets requirements of UL 217, NFPA72 (chapter 11 2002 edition), NFPA101 (One and two-family dwellings), and Federal Housing Authority (FHA). Canadian | Lumber - Kidde Battery Operated Smoke Detectors, with Hush KIDDE SMOKE ALARM - SEALED LITHIUM BATTERY The Kidde Smoke Detector will chirp when it's time to replace the battery. Install a smoke detector & carbon monoxide detector on every level of your home and near bedrooms to help keep your family safe from fire & poisonous gas. Warranty begins when the alarm is powered on. A test-hush button allows you to test the battery operations as well as silence nuisance alarms that may occur from cooking or shower steam. Operates on a 10-year lithium battery, eliminating the need for battery replacement, while providing reliable detection during a power failure Simply press and hold the 'test/hush' button for a minimum of five seconds to hear the test sound – this should stop as soon as your finger is released. For... Test-Hush button makes it easy to test the smoke detector and silence false alarms that occur from cooking or shower steam I9010 Manual One Of My Kidde Smoke Alarms Went Off Last Night. I Hit The Hush Button Smoke Alarms For Home