Walkie talkies are handheld portable radios that use radio waves to communicate wirelessly on a single frequency band. They were first developed in the 1930s by a Canadian inventor named Donald Higgs and, quite independently, by an American named Alfred Gross. They were originally called two-way radios or pack sets, but as the thing that made them really stand out from telephones was the fact that you could both walk and talk at the same time, they became known as walkie talkies.

A GPS tracking device is a portable unit that allows users to monitor and track its location. These devices are most commonly used in vehicles as car tracking systems. While tracking devices are similar to in-car navigation systems, there are a few key differences.