However, the Nest Protect itself doesn't work with Alexa. Nest devices don't work with Apple HomeKit. The Nest Protect smoke alarm has two power options: wired and battery. You can hardwire it into your home’s electrical grid for uninterrupted power, though this option also uses three AA backup batteries in case of a power outage. The battery powered option functions the same, it uses six AAs instead of three, but is better suited for older homes that don't already have smoke detector wiring in place. If you need technical support, you can reach out to Nest by phone, social media and the live chat service on their website. You can also read through the company's helpful support articles about the Nest Protect, which give advice for buying, installing, controlling and troubleshooting problems, among other things. Today's best Nest Protect deals?$94. 99View$115. 99View$127. 65ViewLow Stock$127.