When you are discussing a lock box, they can be used for a number of things. They can range in size from a small box you can hold in your hand to being as big as a microwave. As the name indicates, they use a key to unlock the box. Some of the modern lock boxes may now have a keypad that requires you to type in a number to open it.
from Home Improvement:Security Articles from EzineArticles.com http://EzineArticles.com/9628605
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