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You can keep tabs on these things via security cameras’ monitoring of what’s happening in your home either live or through recorded video.

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If you live in an area that requires a 10 year sealed battery, the Kidde i9010 Est. $25 is worth considering. This is a stand alone, ionization only smoke detector that's been around for a number of years. That may be why user reviews are a little mixed as the overarching complaint among those that are less than completely satisfied is that the smoke detector's battery petered out far sooner than the promised 10 years. Still, its satisfaction ratings are no worse than other cheap ionization smoke detectors that are similar. Examples include 4. 1 stars following nearly 400 reviews at Amazon, for example, and a rating of 4. 5 stars following more than 320 reviews at Home Depot, where this smoke alarm is sold as the Code One 21010019. This is a single unit, and is sold under both the First Alert and BRK brands. It's also available in a two pack as the First Alert SA511CN2 3ST Est. $70, and that's the version that actually gets the most feedback.

 

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Door and window sensors are contact motion sensors that trigger an alarm when the protected door or window opens. Like stand alone motion detectors, these can activate when you’re away from home or whenever you choose. For example, you may keep the window sensors always activated but deactivate the door sensors when you’re at home. These sensors can function as part of your security system or on their own, and they vary in size and design from tiny, sleek sensors to bulky and obvious. Sensors also vary in sensitivity. Some may trigger when the door or window vibrates versus actually opening.