This document discusses portable devices and GPS tracking. It defines portable devices as things that are small and lightweight like laptops, handheld computers, and tablets. It also notes that software can be portable if it can run on different computers without requiring specific hardware. The document then provides details on the Samsung Galaxy S4 smartphone, including its release date and that it became the fastest selling Samsung phone. It also defines GPS tracking units as devices that use GPS to track the location of assets and transmit location data to a database. Finally, it describes the Spark Nano 3.0 GPS tracker as a portable, accurate, and affordable real-time tracking device with custom alerts and reports.