Top 10 Best Optical Fire Alarm

✔Easy installation
✔Test button tests unit's electronic circuitry horn and battery function
✔UL Certified, 10-year limited warranty
✔Test-silence button - allows for test & silence of alarm
✔Ionization sensing technology - smoke detector detects invisible fire particles, 85 decibel alarm alerts of fire

✔Worry-Free After-Sales Services: All X-Sense smoke detectors come with a 60-day money-back guarantee, a 5-year warranty, and lifetime customer support; easy-to-follow instructions are included for convenience; feel free to contact us if you have any questions
✔Quick and Easy Installation: No need for rewiring, as the battery-operated smoke alarm is easy to install with the included screws, anchor plugs, and mounting bracket, or just use an adhesive magnetic pad (sold separately) to effortlessly install it on a wall or ceiling
✔10-Year Battery Life Smoke Detector: Equipped with a sealed 10-year lithium battery for continuous power with no replacement required during the 10-year life of the alarm

✔10-year carbon monoxide sensor. Carbon monoxide is odorless, invisible and deadly. When there’s CO, Nest Protect tells you where it’s hiding.
✔Split-Spectrum Sensor. In an emergency, seconds count. Nest Protect uses two wavelengths of light to look for both fast and slow burning fires.
✔Tells you what and where. It speaks up to tell you if there’s smoke or CO and where the problem is, so you know what to do. Connectivity: Bluetooth 4.0 LE, Wi-Fi 4 (802.11n)
✔With Safety Check you can test all your smoke and CO alarms with just a tap and get a full report once the test is done
✔A Light in the Dark: Usually Nest Protect has its light turned off but when you walk underneath it Pathlight can light your way.
✔With App Silence you can silence the smoke alarm with your phone in the Nest app when there's only a little smoke
✔Get phone alerts so you know something's wrong even when you're away from home[1]
✔Smoke detector and carbon monoxide detector that speaks up in a friendly voice to give you an early warning when there's smoke or CO in your home

✔It can ship within the US except New York
✔Simple to use, with a single test/silence button; EZ access battery drawer allows you to change battery without removing alarm from ceiling
✔Indicator lights on the face of the unit display the presence of smoke or carbon monoxide, while an 85 decibel siren provides a clear, loud warning upon detection
✔Keep your family safe with this battery operated smoke and carbon monoxide alarm; Battery powered alarms provide continuous monitoring of CO levels, even if there's a power failure

✔UL Certified, 10-year limited warranty
✔Test-silence button - allows for test & silence of alarm
✔Ionization sensing technology - smoke detector detects invisible fire particles, 85 decibel alarm alerts of fire

✔Safety and 5 year life: Low battery signal lalarm and "end of life"warning ensures the detector can work normal. Environment friendly, without smell, radiation or harm.If any problem,contact with us without hesitable,we will reply to you asap.
✔Test Slience Button: Tests the unit for proper operation and resets the carbon monoxide alarm,Alarm Volume: Loud > 85dB(A) at 1 meters.Loud 85-decibel alarm is designed to be heard easily.Pls kindly press if false alarm.
✔Photoelectric Smoke Alarm Sensing Technology: A faster sensing technology at detecting the dangerous situation than ionisation alarms, red LED will flash and the alarm pattern will sound, Loud 85 decibel alarm with compensation design.

✔UL Certified, 10-year limited warranty
✔Protects during a power failure - combo smoke and CO alarm operates on 2-AA batteries
✔Fire & CO detector in 1 unit with alert modes, LED lights, & voice alarm, that states, "Fire Fire", "Warning Carbon Monoxide", or "Low Battery"

✔85 decibel alarm
✔Inter connectable with BRK and first alert hardwired smoke and carbon monoxide alarms
✔120 volt hardwire smoke alarm with photoelectric sensor and battery backup

✔4-way flame sensor module Fire detection Fire source sensor module Infrared reception

✔4.Muti-mode alarm sound tone the voice can reach to 110db ,for all people to heard
✔2.Be with 6pcs Leds super bright when send out alarm signal,effectively remind people flee from fire.