Overview: The Wi-Fi-enabled 2nd Generation Nest Protect is designed to
detect smoke and carbon monoxide in a residential environment. It is equipped
with a new Split Spectrum photoelectric sensor that can tell the difference
between smoke and steam, so there are fewer false alarms. Nest Protect will alert you with a horn and a human
voice when smoke or carbon monoxide are present. It can also send notifications to your
smartphone or tablet to alert you of an emergency when you're not at home. Nest Protect's
color-coded light ring changes color to alert you or simply
lights your way in the dark. This model is powered by six long-life AA Lithium
hard-wired 120V version is also available.
Heads Up and Emergency Alarms: Typical smoke detectors only
have the loud piercing full alert that cannot easily be silenced. During false
alarms, or when you simply burn the popcorn, the smoke detector's batteries are
sometimes removed, putting occupants of the home in danger. Nest Protect offers two levels of alerts: Heads Up and Emergency
Alarms. Nest Protect can detect low levels of smoke or carbon monoxide, and
provide a gentle Heads Up as an early warning. This lets you ascertain what the
problem is (through its voice message), and silence the alarm while the unit
continues to monitor your home. If conditions worsen, the unit will sound a full
Emergency Alarm with an 85dB horn (at 10 feet) and voice instructions (at 80dB
at 3 feet) informing you what and where the problem is.
Network Connection: When every Nest Protect installed in
your home is connected to
your wireless network, they work together to keep you safe. When one unit
detects an emergency, all connected units will alert you, and tell you which
room the smoke or carbon monoxide is in. Typically, a Nest Protect unit can communicate other
ones if they're within 50 feet from each other. The range varies due to the
number of floors, building materials, duct work, large metallic appliances, etc.
Nest Protect can also work with the
Nest Learning Thermostat (when connected to the same wireless network) to
improve the Auto-Away algorithms (through the Nest Protect's occupancy
detectors), and automatically shut off your heating, a possible source of carbon
monoxide leaks, if high levels of carbon monoxide are detected.
Nest App: You can connect to your Nest Protect (and Nest
Learning Thermostat, if you own one) using your smartphone or tablet through the
Nest App. The app can immediately alert you when you receive a Heads Up or
Emergency Alarm, or you can use the app to check the status of your Nest Protect
units while you're away. The new App Silence feature will allow you to quiet the
alarm from your phone using Bluetooth LE, once you have made sure everything is
OK. The app can also provide you a Safety History, showing
what has happened over the last 10 days. The Nest App is compatible with iPhone
and iPad (requires iOS 8.0 or later), and Android devices (running Android 4.0.3 or
Sensors: Nest Protect features eight sensors for detecting
dangerous levels of smoke and carbon monoxide in a room, and to analyze its
- Smoke: A commercial-grade photoelectric sensor uses light to detect
smoke particles in the air. This Split-Spectrum uses two wavelengths of
light (450nm and 880nm) to detect different kinds of smoke to catch both
fast-burning and slow-burning fires quickly. A new smoke chamber with a
stainless steel screen helps reduce false alarms caused by dust or bugs.
- Carbon Monoxide: This carbon monoxide sensor detects the presence of
carbon monoxide, a colorless, odorless gas.
- Heat: A built-in heat sensor can detect a sudden rise
- Humidity: A humidity sensor measures the amount of
moisture in the air.
- Ultrasonic: Two ultrasonic sensors detect movement in
- Occupancy: An occupancy sensor detects when you are
directly under the Nest Protect at night to turn on the Pathlight.
- Ambient Light: An ambient light sensor lets the unit
know when its dark, or when lights are off in the home. This is used for the
Nightly Promise and the Pathlight.
Self-testing: Nest Protect self-tests its sensors and
batteries 400 times a day to make sure everything is working properly. As with
the original Nest Protect, you can manually push the button on one detector and
test every connected alarm in the house. This 2nd Generation unit lets you
manually test all of your alarms from your phone. The Safety Checkup will test
the sensors, power, Wi-Fi connection, horn, and speaker in the home with one
tap. Once a month the system runs a Sound Check to make sure the horn and
speaker do their jobs.
Light Ring: Nest Protect's light ring is both informative
and functional. Most of the time, the light ring will be off. Its color-coded
light has the following meanings:
- Blue: A blue light indicates the unit is active and is
ready to be connected or tested. It glows blue before and after a manual
test, and during setup.
- Green: A green light means conditions are normal. The
light ring pulses green during and after setup to confirm it is connected to
the Internet. It also lets you know all of its sensors and batteries are
working correctly (see Nightly Promise below). After an emergency, a green
light will indicate that the levels of smoke or carbon monoxide are
returning to normal.
- White: The light ring glows white to light your way as
you pass by. (See Pathlight below.)
- Yellow: Nest Protect glows yellow to indicate an
advanced warning. When you press the Nest button, the unit will tell you in
a human voice what the warning is. It can give you a Heads-Up alert that low
levels of smoke or carbon monoxide have been detected. It can also indicate a low
battery, problem with a sensor, or that the unit has expired. (The unit
expires seven years after its manufacture date as indicated on the back of
the unit.) You can silence the warning, after which, the light will continue
to glow yellow to indicate the problem still exists.
- Red: The red light indicates that the unit has detected
dangerous levels of smoke or carbon monoxide. In addition, a loud alarm
sound accompanies the red light, and a human voice tells you what and where
the danger is. You can press the Nest button to silence the emergency alarm,
but the light ring will continue to glow red, while continuing to monitor
Nightly Promise: Nest Protect continuously monitors its
internal sensors, batteries, and Wi-Fi connection. Nightly Promise uses the
ambient light sensor to determine when you turn out the lights at night. The
unit glows green for a moment as you turn out the lights to indicate the sensors
and batteries are all working properly. If the light ring glows yellow, it means
the unit has detected a problem. When you press the Nest button, the Nest
Protect's human voice will tell you what the problem is. You can also view the
messages on the Nest App on your smartphone or tablet. This eliminates the
annoying low-battery chirp coming from typical smoke detectors.
Pathlight: With the Pathlight feature, you no longer have to stumble around in the dark, or search
for a flashlight or your smartphone to light your way. Nest Protect uses its occupancy and ambient light
detectors to determine when you pass underneath the unit when the lights are
out. The Pathlight feature briefly illuminates the light ring (white light) when
you walk under the Nest Protect, and turns it off again approximately 10 seconds
after you pass by. You can also program Pathlight to illuminate continuously
when it's dark, if you wish to use it as a night light. The brightness of the
light can be adjusted in the Nest App, if desired.
Installation: Installing the Nest Protect is simple. The
unit comes with a backplate that can be mounted to a ceiling or wall with the
four supplied screws. The backplate has four hooks that enable quick and easy
mounting and removal of the Nest Protect unit.
Batteries: The Nest Protect is equipped with 6 AA-sized
Energizer Ultimate Lithium (L91) batteries, which are designed for long life.
Nest Labs recommends replacing exhausted batteries with the same type.