Systems, methods and apparatuses of tracking locations of a computing device and recording locations of sensor units are disclosed. The system provides a multi-frequency tone signal containing item data applicable to items on a shelf associated with an electronic display strip and containing the address code of that particular strip. Such a transformation is achieved in a period of time less than 1 hour whereas the known methods call for periods of time as much as 10 times longer. The branch supports may articulate with the main body to permit the branches to pivot laterally from the axis of the main body throughout a substantial range of motion.