usability, price, design, size

reliability

63% of the reviews on Amazon.com give this product a positive rating.

Looks superb ; Easy to install ; Works flawlessly ; Polished browser & app UI ; Brings peace of mind

Costs 10-20x a dumb alarm

This means, for example, should the Protect detect gas it can tell the Nest thermostat to switch it off. This is where the Internet of Things and ecosystems within it become even more interesting.

Brilliant execution ; Build quality ; Excellent UI

Price

Monitor status via your phone, acts as a nightlight, battery lasts for 5 years, will connects to other Nest products, speaks to you, wave to turn off alarm

Expensive, need to have Wi-Fi for it to work, other Nest products absent from UK at time of writing

There is no doubting the Nest Protect is a very clever device that works as prescribed and achieves what it sets out to do. It looks good, can communicate with other Nest devices, and thanks to the app you can even detect a fire when not in the home....

With boutique design, remote monitoring via mobile device, and the ability to wave off false alarms with your hand, the ; is the smoke/CO detector we never knew we wanted.

$129 is a lot to ask for a smoke/CO detector, even a connected one.

Nest brings crisp design and smart features -- connected and otherwise -- to the humble smoke detector. You don't absolutely need the Nest Protect, but it's fine to admit you want one.

Works with iOS or Android app ; Attractive design ; Heads-Up voice feature

Expensive ; Not available in Australia yet

The Nest Protect is a smoke and carbon monoxide detector that allows users to control its settings and check its battery life using a dedicated iOS or Android app. Unfortunately, it's not available in Australia just yet and it's also expensive.

Remote control via a mobile app ; Clever uses of color notifications ; Sleek design

Expensive for a smoke detector