Accurate, Reliable, & Highly Sensitive: This Smoke and Carbon Monoxide Detector Adopts the Most Advanced Photoelectric Sensor, Enabling the Fire and CO Alarm to Quickly Detect Dangerous Smoke levels from Slow-Burning, Smoldering Fires; Provides the Earliest Possible Warning of Fire While Minimizing False Alarms.^ Hush Function: This Smoke and Carbon Monoxide Alarm Fire and CO Alarm Has Been Redesigned from The Inside Out, and it Will Confirm that Smoke Detector Triggers the Alarm Instead of Interference by Taking 3 Separate Smoke Samples, Minimizing False Alarms to Avoid Waking you From Sleep.^ Easy Install & High Quality: This Smoke Alarm and Carbon Monoxide Detector Can Easy to Mount on any Wall or Ceiling with the Included Mounting Bracket, Screws and Anchor Plugs, No Hardwired Need. Certified to Meet the UL 217 & UL 2034 Safety Standards for your Peace of Mind and Absolute Confidence in our Product.^ 10-Year Battery:This Smoke Detector/ Carbon Monoxide 10 year Battery of Continuous Bower with a Built-in lithium Battery, Saving on Energy while Remaining Eco-friendly; Saves you from Constantly Having to Change Batteries; an End-of-life Signal Will let you Know When it's Time to Replace the Unit for Safety.^ FASTER RESPONSE TO DANGERS WITH LOUD 85 DB ALARM: Gives you the earliest possible warning of smoke and carbon threat with both a loud 85 dB alarm and a rapid flashing red LED indicator; this alarm is sure to wake up you and your family, even when sound asleep.