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I want to install some security devices in my garage to increase the garage security.And thinking to install security system or any security alarm.But what you think which one is best to install because i already have alarm system installed in my all vehicles?

For these environments, IR sensors are the most effective. Check for PIR sensors which can be tuned to detect only humans. You may also think of moving to laser based security which is bit more expensive than IR. Since lasers are generally used for high security environments, I think PIR would be the most workable solution.

Hello neo thanks for your suggestion.But due to unemployment i don't have more money that i can pay for that system i want cheap.That just control over on the garage door or some area inside the garage.

As far as I know, PIR sensors are not expensive. You may see IR sensors in following link for IR sensors. PIR sensor is about $5.
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