This GPS Pen is a tiny GPS tracker not much bigger than a thumb drive, which you can stick just about anywhere and retrieve as necessary. The thing will remember up to 94,000 locations, every 5 seconds for over 70 days. And when it’s done its sneaky little business you just pop the lid, stick it straight into your laptop and download the tracking data into Google Earth. Powered by two AAA batteries and priced at £99.00.
https://www.youtube.com/watch?v=18GrWI8_PDQ
The GPS Pen is a true plug and play device. Simply plug it into your PC and the software automatically downloads to your PC. It will then open a map and show its movements without you doing anything! The GPS pen stores all its movements on an internal memory chip. The closest comparison that you may be familiar with could be a black box recorder on an aircraft.