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The best part is if there’s a power outage, most wireless equipment includes a backup battery to work. Monthly plans are often less expensive than wired home security systems, but there are drawbacks to consider. Once you’ve set up your home security system, you may need to add extra security cameras or sensors to monitor blind spots that may be out of range. Some home security companies sell additional equipment at a discounted rate if you’ve purchased their home security system. If not, adding additional equipment can be fairly inexpensive. Adding an extra indoor security camera can cost upwards of $100 or an extra door sensor can cost around $30.
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In the science fiction movie "Gattaca," Ethan Hawke's character was able to get into a secure area using nothing but a scan of his retina.
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This is lower than the $37 average on traditional security systems and doesn't require a contract; not all DIY security systems have professional monitoring.