How to choose DIY alarm system for home, shop, warehouse?

Security alarm systems have been available to only large businesses and wealthy people in the past. Since the rapid changes in the home alarm industry, manufacturers offer wide range of security alarm systems at prices most people can afford. Now every people can purchase a set of DIY alarm for their home property or commercial business. There are huge among and diversity DIY alarm systems are selling in Ebay and Amazon. A lot of people are wondering how to find the best DIY wireless alarm that can give them the peace of mind.