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Feature

Know from anywhere - Connect Nest Protect to Wi-Fi and it will send a message to your phone if the alarm goes off or the batteries run low
Tells you what and where - It speaks up to tell you if there's smoke or CO and tells you where the problem is so you know what to do
Nest Protect sees the CO you can't - Carbon monoxide is odorless, invisible and deadly. When there's CO, Nest Protect tells you where it's hiding
Nightly Promise - Nest Protect tests its sensors and batteries constantly and lets you know they're working with a quick green glow at night
Silence the chirp - Low-battery chirps ever rattle your dreams? Nest Protect shows you its batteries are good. Before you doze off

Description

The Nest Protect has been redesigned from the inside out. It has an industrial-grade smoke 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 just like the original Nest Protect, it tells you what's wrong and can even alert your phone. 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. No one should be woken up by a low-battery chirp at 2am. 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. Heating systems can cause carbon monoxide leaks or spread smoke through your home in a fire. In an emergency, Nest Protect tells your Nest Thermostat to turn off the heat to keep the danger from spreading.

Specifications
Generation: 2nd Generation
Power: 6 AA Batteries
Speaker: 2 Watt
Horn: 85dB SPL at 10 feet (3m)
Light Ring: RGB color ring with 6 LEDs
Requirements: Wi-Fi Connection, Internet Access, Nest App

Sensors
SplitSpectrum Sensor, 450nm and 880nm Wavelength
10 Year Electrochemical Carbon Monoxide Sensor
Heat Sensor, 1.8F ( 1C)
Humidity Sensor, 3%RH
Occupancy Sensor, 120 Field of View to 20 Feet
Ambient Light Sensor, 1-100k Lux Dynamic Range
Omnidirectional microphone, 70dBA SNR
Wireless: Wi-Fi 802.11b/g/n @ 2.4GHz, 802.15.4 @ 2.4GHz, Bluetooth Low Energy (BLE)

Includes
Nest Protect (Battery)
Nest Backplate
Nest Screws (4)
Nest User's Guide
Nest Welcome Guide
Nest 2 Year Warranty
Energizer Ultimate Lithium "L91" AA Batteries (6)
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