GlobalSat TR-102 is a portable personal GPS tracker that can be used for family and employee tracking. It is well-designed (including the special design for kids) and have good functionality.
It has a high-sensitive GPS receiver that can work even with a poor signal. It is equipped with a microphone and speaker for mutual voice communication with 10 people from a contact list.
Also, the device has a SOS button that sends an emergency SMS with tracker's carrier coordinates.