The Concept 3000 / Access 4000 is the most flexible, scalable, cost-effective Intruder Alarm, Access Control and Building/Home Automation system on the market today. Regardless of the size of your system, modular design and flexible memory size options ensure that you are only paying for what you need. Furthermore, incredible expandibility and on-going product development and support ensure that a Concept Access 4000 or Concept 3000 system purchased today is a long term investment in your security management plan, avoiding the need to replace a system that will not keep pace with your needs.