Nest Protect Wired Smoke/Carbon Monoxide Alarm (2nd Gen) + Nest Learning Thermostat

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"