Google Nest Protect Wired Smoke and Carbon Monoxide Alarm (4-Pack) w/ Warranty Bundle

It's time to expect more from your smoke alarm.
Nest Protect has been redesigned from the inside out. It has a Split-Spectrum Sensor, tests itself automatically and lasts up to a decade. It's also the first home alarm you can hush from your phone without any extra hardware required. And it tells you what's wrong and can even alert your phone.

Thinks, before it speaks.
Nest Protect has a friendly human voice that gives you an early warning. That way you can handle burning toast before it becomes a burning toaster.
Tells you where the danger is.
And when one speaks, they all speak. So the alarm in your bedroom can tell you there's smoke downstairs.

Sees both fast and slow burning fires.
The foam and particle board in much of today's furniture make fires burn faster. Technology should keep up. The Split-Spectrum Sensor uses two wavelengths of light to detect smoke from both fast-burning and smoldering fires.

10-year CO sensor.
Carbon monoxide is poisonous but you can't see it or smell it. That's why Nest Protect has the most accurate type of carbon monoxide sensor available. We also improved our carbon monoxide sensing algorithm. And we'll keep working to make it better and better because people depend on it.

Thoughtful, not annoying.
Tests itself: You're supposed to test smoke alarms monthly. But 9 out of 10 people don't. So Nest Protect checks its batteries and sensors over 400 times a day. And it's the first alarm that uses Sound Check to quietly test its speaker and horn once a month.
Count sheep, not chirps.
No one should be woken up by a low-battery chirp at 2 a.m. When you turn off the lights, look for a quick green glow. That's our Nightly Promise. It means all your Nest Protects have tested themselves, the batteries are good, and there won't be any chirps. Sweet dreams.

Specifications:

• Wireless   
  Working Wi-Fi connection: 802.11 b/g/n at 2.4 GHz
  Wireless Interconnect: 802.15.4 b/g/n at 2.4 GHz
  Bluetooth Low Energy (BLE)
• Sensors   
  Split-Spectrum Sensor, 450 nm and 880 nm wavelength
  10 year electrochemical carbon monoxide sensor
  Heat sensor, -/+ 1.8°F (-/+ 1°C)
  Humidity sensor, -/+ 3% RH
  Occupancy sensor, 120° field of view to 20'
  Ambient light sensor, 1-100k Lux Dynamic Range
  Omnidirectional microphone, 70 dBA SNR
• Audible Indicator   
  Speaker: 2 W, 80 dB at 3' (1 m) at 1 kHz
  Horn: 85 dB SPL at 10' (3 m)
  RGB color ring with 6 LEDs
• Languages   
  United States: English, Spanish
  Downloadable: English, French, Spanish, Dutch
• Requirements   
  Wi-Fi connection
  Phone or tablet with iOS 8 or later, or Android 4 or later
  Free Nest account
• Certification and Compliance   
  Underwriters Laboratories Inc.
  California State Fire Marshal
  UL 2034 - Single and multi station carbon monoxide alarms
  UL 217 - Single and multi station smoke alarms
  NFPA-72 - National fire alarm and signaling code
• Environmental   
  Installed Environment Temperature Range: 40 to 100°F (4 to 38°C)
  Relative Humidity Range: 20 to 80% (non condensing)
• Dimensions (HxWxD)   
  5.3 x 5.3 x 1.5" / 13.5 x 13.5 x 3.9 cm
• Weight   
  13.2 oz / 375.0 g
• Package Weight   
  1.85 lb
• Box Dimensions (LxWxH)
  6.3 x 6.3 x 2.8"