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Entry control is one other very important component that must be thought about.

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In the Washington D. C. area, there are more than 30,000 surveillance cameras in schools, and the Metro has nearly 6,000 cameras in use across the system. The Cheshire figure is regarded as more dependable than a previous study by Michael McCahill and Clive Norris of UrbanEye published in 2002. Based on a small sample in Putney High Street, McCahill and Norris extrapolated the number of surveillance cameras in Greater London to be around 500,000 and the total number of cameras in the UK to be around 4,200,000. According to their estimate the UK has one camera for every 14 people.

 

Blandit Etiam

Image credit: Philips "Which systems are good for learning how to install full home smart systems?" AdicommunicationsukAs we explain in our Smart Home Guide, a smart home can be as simple as a set of lights that you can control from your phone. Or it could be a whole home setup in which your lights, thermostat, locks, security cameras, smoke detectors, garage door openers and more are all interconnected and can react in different ways when one of them is triggered. For example, you can have all your lights turn on when your smoke detector starts blaring, or you can have all the lights turn off, the locks lock and your security camera turn on with a single command. MORE: Our Favorite Smart Home Gadgets and SystemsIf you're just getting started, I would recommend getting the Philips Hue White Starter Kit $69 and the Amazon Echo Dot $49. Philips' lights provide one of the least expensive ways to get started and should give you a taste of what you can do. From there, you can connect the lights with the Echo Dot, so you can turn them on or off using Alexa.