Nest Protect 2nd Generation Smoke and Carbon Monoxide Detector (Wired)

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Quoting product code: A45TR


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About this product


  • Wired Smoke and carbon monoxide detector that connects to your smartphone and sends notifications if activated
  • Split-Spectrum Sensor detects both fast and slow burning fires giving you better protection
  • Coloured LEDs showing different alerts in different situations. Yellow for rising levels of smoke and CO, red when the alarm sounds and green for decreasing levels.

Product overview

• Wired Smoke and carbon monoxide detector that connects to your smartphone and sends notifications if activated
• Split-Spectrum Sensor detects both fast and slow burning fires giving you better protection
• Coloured LEDs showing different alerts in different situations. Yellow for rising levels of smoke and CO, red when the alarm sounds and green for decreasing levels.
• Interact with the detector using the Nest Smartphone App and silence false alarms
• Voice alarms with custom locations telling you where the alarm is coming from
• Nest has been rigorously tested and has met the BSI standard ratings of EN-14604, EN-50291, EN-50271:2010 and EN-50292.
• Connect to the Nest Thermostat to turn off the heating if CO levels are detected or even connect to the Nest Cam where the footage is recorded as soon as smoke or CO is detected.
• Mains powered with 3 x AA battery back-up

What makes Nest Protect different from other CO alarms?
The Nest Protect CO alarm is a combined smoke and carbon monoxide alarm that connects to your smartphone through your wireless router. The free Nest app will keep you informed of the change in CO and smoke levels in your home, wherever you are in the world. The app allows you to view accurate information which would not normally be available with any standard alarm. This alarm is a two in one device that is perfect for use in the new age of technology with the increase in use of smartphones. Nest Protect checks itself over 400 times a day and lets you know if something’s up.

Does the Nest app send push notifications?
The Nest app sends push notifications with a different alert for different situations. The flashing LEDs on the alarm and the speaking voice from the app let you know what the situation is when it arises.

Is the alarm easy to install?
The alarm is simple and easy to install. Plug the device into the mains and once you have downloaded the Nest app, it is as easy as scanning the QR code on the bottom of the unit and the app will then guide you through the rest of the process.

What advantage do I have of buying the extra Nest items?
All the Nest items are interlinkable with each other. This means you can keep you home safer and even more secure. Link the Nest Protect with the Nest Thermostat so when the alarm detects the CO levels rising it automatically shuts off the heating to keep you safe. Link up with the Nest Cam and when the alarm detects smoke it the camera starts to record so you can go back and see what happened.

Rated 5 out of 5 by from Great Product Installed 2 and both have been faultless, detects both fire and Co2, air quality reports to your phone and also has a nice nightlight feature when you walk upstairs.
Date published: 2016-08-23
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Power Source
Mains Yes
Battery No
Mains and Battery Back-up Yes
Low Battery Indicator Yes
Built-in Battery No
Heat No
Smoke Yes
Carbon Monoxide Yes
BS BS EN-14604, EN-50291, BS EN-50271:2010, BS EN-50292
Other N/A
Wireless Yes
Wired No
Links with Other Alarms No
Links with Other Security Systems No
Control and Notifications
Manual Yes
Automatic No
Remote Controlled (Via Keyfob Remote or App) Yes
Push Notification Alerts Yes
Strobe Light LED
Siren Yes
Siren Loudness 85 dB
Siren Duration Until reset
Operating Range
Maximum Operating Range 20 m
Transmission Frequency 2.4 GHz
Operating Systems and Protocols
IOS iOS 8.0 or later
Android Android 4.0.3 and up
Expandable With other Nest appliances
Operating Power AC 230V / DC 4.5 V battery backup
Dimension 135 mm x 38.5 mm x 135 mm
Weight 375 g
Battery Type:
For Control Unit 3 x AA batteries (backup)
For Sensors and Accessories N/A
Test Mode Button Yes
Installation Position Ceiling/Wall
Package Contents
Nest Protect (Wired 230 V)
Three long-life backup batteries (Energizer® Ultimate Lithium "L91" AA)
230 V AC connector
Three wire nuts
Back plate
Four screws
User’s guide
Welcome guide

Can you covert battery operated one to mains power as batteries don't last long enough .

Asked by: Mark
Unfortunately we are unable to guarantee full compatibility for this item, as this is not the manner for which it was designed to be used.
Answered by: Dominic
Date published: 2017-05-08

I understand that there are 2 sets of 3 batteries which are used up at different rates. How long does each set last ? Could I swap them over half way through to get better usage ?

Asked by: Pureedfruit
Hi there, You have posted this question on the wired version of Nest Protect, which will of course have line power but it will only have 3 back up batteries. There is no order to which the batteries will be used either in the wired or battery only version. The battery version does use 6 batteries. Team Nest UK
Answered by: Nest Support
Date published: 2016-12-26

can I add other nest wirless to the main one in different rooms ? I have a restaurant and I want 4 of them in different area without any wires. also can I disable while we working if I put one in the kitchen ?

Asked by: ciros
Hi Ciros, So long as your Nest Protects can all connect to your WiFi, you can add them anywhere in the property within that range. Regarding placing Nest Protect in a commercial kitchen, it isn't possible to disable any smoke alarm for safety reasons but Nest Protect has intelligent sensors and software to allow it to determine the difference between smoke and steam. This should keep false alarms to a minimum for you. Hope this helps! Team Nest UK
Answered by: Nest Support
Date published: 2016-08-31

If the alarm rings, can it be stopped via pushing a button on the unit it or must it be stopped via the App?

Asked by: Jonjon
Hi JonJon, Nest Protect Generation 2 (This model) may be silenced either by physically pushing the button on the Protect or via your Nest App, while within Bluetooth range (This is a safety feature which ensures the area was checked for fire before silencing) Team Nest UK
Answered by: Nest Support
Date published: 2017-10-13

Is this the 2nd gen nest protect?

Asked by: GBoy
Yes, this is Generation 2 Nest Protect.
Answered by: Russell
Date published: 2015-11-04

are these inter-linkable to confirm with latest regulations  

Asked by: den28
Nest Protect is approved by BSI standards. After you connect your Nest Protect to Wi-Fi and with your Nest Account, it will automatically interconnect with any new Nest Protects you associate with your Nest Account. Communication between Nest Protects is called Wireless Interconnect and allows multiple Nest Protects to talk to each other during an alert or emergency alarm.
Answered by: Russell
Date published: 2015-11-04

Hi, I need a heat sensor in the kitchen rather than a smoke alarm - so my builder tells me - will this suit kitchens or is there a hear monitor mode / version? Thanks

Asked by: Boycey
I am sorry but the item in question does not support use in your intended application.
Answered by: Russell
Date published: 2015-10-27
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