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 sales figures. It defines a GPS tracking unit as a device that uses 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 small, battery-powered, real-time tracking device with customizable alerts and reports.