door security bar
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. The revolution brought on by wireless technologies, smart phones, and mobile apps have changed all of that. Today, home security systems
can still sound alarms, but are much more difficult to forget about or foil. A software supported security system can send you a text message every time a door or window is opened, whether you’ve armed it or not. It can stream live video or send still images of what’s happening in your garage, living room, backyard or wherever you deploy a security camera.