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They can generally detect motion from 40 to 80 feet away and can be connected to your home alarm system or to a security camera. There are two main types of home security motion sensors: active detectors,whichemit light, sound or other forms of energy and recognize when that energy is being disturbed; or passive detectors, which recognize incoming signals sent from the disturbance, such as heat or sound waves. DIY smart home security systems let you monitor your home from any location using a mobile app. T

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05.04.2010