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Every detector sounded within 30 seconds at the 5 foot mark. Three smart smoke alarms –Nest Protect, Halo+ and First Alert Onelink – went off at the 10 foot mark. All but one of the smoke detectors, the Nest Protect, failed to detect dangerous levels of smoke at the 15 foot mark. How Much do Smart Smoke Detectors Cost?Always weigh the costs against the benefits you might get from a smart smoke alarm. On average, you can expect most smart smoke detectors to cost around $100, though some units cost as much as $250, which can be up to 10 times more expensive than normal units. This can make replacing all of the existing smoke detectors in your home very expensive. To keep costs down, consider using traditional units throughout your home with smart smoke detectors in main areas. Traditional smoke detectors typically cost between $10 and $40. Here are a few basic models that are popular on Amazon:First Alert BRK 3120B $27. 18 This hardwired alarm uses both photoelectric and ionization sensors to detect smoke. It does not have a carbon monoxide sensor.

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9/5 Product RatingThe PKD DK4216 500GB Security Camera is an advanced H. 264 smart DVR that will allow you to access the security camera remotely from the internet. You can access the security camera using the internet or your 3G smartphones including blackberry, android, iPhone, or iPad. The PKD DK4216 500GB Security Camera includes four indoor/outdoor night vision cameras with 60 feet of cable per camera, a preinstalled 500GB security hard drive, and a simple point and click interface all combined into an easy to use H. 264 smart DVR. With network access, VGA video output, and USB 2.