Most of us use Burglar alarm devices to keep our house safe. You call the
company that serves in your area like ADT and all and they set up the
alarm device in your house. Now anytime someone opens the door, you get to
know with a beep tone.
If you are wondering how these devices work and keep you safe, learn from
the infographics below:
Feel free to share with your friends on Twitter and Facebook etc.[Posted through ifttt]