Best answer: A Nest Protect will work for you as long as you're in one of the 20 countries listed below. Nest Protect is designed to work on your home's electrical service or by battery and can be used alone, in tandem with other fire alarm equipment, or with other Nest Protect units.
Amazon: Nest Protect ($124)
Nest Protect power requirements
There are two ways you can power a Nest Protect: by battery, or wired into your home's electrical service. You'll have the option to choose which type of device you need during the buying process, and as long as you buy a Nest Protect designed for your country it will work with your local electrical service.
Where do Nest products work?
Nest products, including the Nest Protect work in the following countries:
- New Zealand
Nest has the following to say about buying and using Nest products in other countries:
Nest products are not designed and tested for use in all countries, and customer support in local languages is not available in all countries.
If you choose to use Nest products outside the countries listed above, you do so on your own initiative, and you are solely responsible for complying with applicable local laws in your country.
To the extent permissible by law, Nest accepts no responsibility or liability for any damage or loss caused by use of Nest products in countries other than those listed above.
If you're replacing or adding smoke detectors, the Nest Protect is your best buy.
A smoke detector needs to warn you when appropriate, and not give false alarms. The Nest Protect excels at both and also provides excellent carbon monoxide detection. Because they're from Nest, they are easily integrated into any home automation plan and work with Amazon Alexa and Google Assistant.