Burglar Alarm System Packages - Ademco, DSC, ELK, GE, Napco, Paradox, and Visonic. On these pages we have assembled all of the components needed to build a complete security alarm system. All of our systems are offered with or without 24-hour monitoring service. The pages may take a minute or so to load over a dial-up connection. If you need assistance, please call our tech support toll free at 877-722-8900. We will be happy to help you choose the right system and accessories for your project.