gps tracker V520 1.Smallest tracker in the world 2.SMS/GPRS work all over world 3.application: the elderly, children, ... select, working allover the world.Support SMS communication or GPRS TCP connection.Get the position information via mobile phone SMS ... upgrades. Lightweight, compact, dynamic, fashion design.Specification:Mode: GSM/GPRS double frequency 900/1800 (850/1900 optional)Exterior: Small four ...