Choose the First Alert PR710 10-Year Smoke & Fire Alarm with our new round slim design and maximum protection photoelectric technology. It"s protection at its finest and lasts a full 10 years without the hassle and expense of twice a year battery changes. Our patented smoke entry system allows for a direct path to the smoke sensor, helping to minimize nuisance alarms that often come from cooking smoke or shower steam. In addition, this maximum protection smoke and fire alarm uses photoelectric smoke sensing technology that detects smoke particles most commonly produced by smoldering fires. Loud 85dB alarm sounds if hazard is detected. Single test/silence button mutes unnecessary alarms and tests fuction. Simple twist/lock mounting bracket makes it quick and easy to install your First Alert smoke alarms. End of life timer sounds when it"s time to replace your alarm. Backed by 10 year limited warranty from First Alert.