1)GSM900/18000MHz,GSM850/1900MHz(optional or quad band) 2)SOS alert 3)2 way voice communication (optional)&Voice monitor (opti Mini Car Gps TrackerGSM/GPS/GPRS Small,Simple & Save your money Special Points1. Build-in GPS antenna and GSM antenna (optional: also support external GPS & GSM antenna)2. Mini size: 50mm x 45mm x 21mmThe two points above make the tracker easily can be install many place ...