All you need is a working SIM card (NOT included!) to insert into the device, then you can track and map (with Google Maps) in real-time over the Internet.
What is the smallest tracker device?
Geoforce Releases the World's Smallest Industrial GPS Tracking Device. – Geoforce, the leading provider of global track and trace solutions for field equipment, announced today the widespread commercial availability of the GT0, the world's smallest industrial GPS asset tracking device.