9-volt
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Roost's smart battery will school your old smoke alarm
If you're intrigued by Nest's Protect, but think spending $99 for a fancy smoke alarm is kind of crazy, Roost's WiFi connected 9-volt battery is worth keeping an eye on. It plugs into any old smoke alarm to make it "smart," as is the custom of our time. You'll get mobile alerts when the battery is low, or if your alarm goes off while you're away from home. Say goodbye to those annoying middle-of-the-night low battery chirps.
