PROX-IN-A-BOX™ is easy to install, program and operate. No PC is required to install or operate the system's standard four-door controller. The two proximity readers and 25 ultra-thin, durable proximity ISO cards included in the starter kit help you create the kind of access control solution you want. Installing PROX-IN-A-BOX™ is as easy as installing an alarm system. Expandable up to 4 controllers for 16 doors with 4 inputs per door, Proximity readers and cards included, 3,000 keys and 1,000 events capacity. Convenient starter kit: PIAB-1 CONTROL UNIT