A wireless local area network control system includes network elements and a centralized dynamic performance management system. The storage units, wheel assemblies and rails are produced and shipped in disassembled, knockdown kit form, and are assembled on-site in either a lateral high density configuration or a pull-out high density configuration. The method also includes the step of receiving, with a processing device of a position detection server, a video signal from an electronic device possessed by a consumer as the consumer shops in the retail store. A photodetector in the scanner measures the reflected beam and determines distance and position of the target by accurately measuring timing of the reflected pulses.