The main hub has integrated battery and cellular backup as well, so if you monitor a vacation home and want to keep the Wi-Fi off, it can send text alerts when something goes awry. Each sensor’s batteries are rated to last about two years. Photo 4 of 5 in These Tiny Hubs Will Make Your Home Smart and Safe by Alexander George

These Tiny Hubs Will Make Your Home Smart and Safe

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The main hub has integrated battery and cellular backup as well, so if you monitor a vacation home and want to keep the Wi-Fi off, it can send text alerts when something goes awry. Each sensor’s batteries are rated to last about two years.