Roost smart battery, $35

roost smart smoke alarm battery

The Roost, a $35 9-Volt Wi-Fi battery for your smoke alarm, will notify your smartphone when your smoke detector is going off, it will let you silence your smoke alarm from an app, and it will send low-battery alerts to your phone -- no more 3 a.m. wakeups.

First published December 22, 2015: 2:55 PM ET

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