Save yourself some of the headaches that accompany necessities like smoke alarms—like waking up at 2 a.m. to the unnerving intermittent chirp of a low-battery warning—when you make the switch to a smarter detector. Upgrading your smoke alarm takes only two steps: Replace the 9-volt battery in your existing smoke alarm with the Roost battery, then set up its corresponding app on your smartphone. This battery will notify you when your alarm goes off even if you aren't home, allow you to easily silence the beeping, and remind you when it's time to replace the battery. (That won't be anytime soon, though—they last for more than five years!) Available on Amazon; $65.