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You should also consider whether the external doors themselves are strong enough to withstand attack. Security doors can be expensive, running into thousands for steel reinforced doors in steel frames. But there are cheaper options — a Burglarybuster Nightlock Pull Up Security Bar can be purchased for €69. This bar can be laid across external doors at night. It reinforces the lower part of the door and means efforts to knock it in will create far more noise — always effective in deterring burglars. Windows should be fitted with locks.
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If not placed somewhere discreet, the motion detectors are obtrusive and look like a child’s night light.
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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.