How much for a good home security system?

What do I need for a basic home security system. I don't want anything elaborate as I live in a "safe" area. I want something like a remote operated button that my elderly mom can push in an event someone breaks in. A loud alarm that will go off both inside and outside to "scare" any... show more What do I need for a basic home security system.

I don't want anything elaborate as I live in a "safe" area.

I want something like a remote operated button that my elderly mom can push in an event someone breaks in. A loud alarm that will go off both inside and outside to "scare" any robbers and alert her neighbors.
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