... (Tee,Jacket,Sweater and all Accessories),Pet Carrier,Pet ... /1800/1900GPS chipSIRF3 chipGSM/GPRS moduleSiemens MC55 or Siemens ... the GPS satellites and GSM(850/900/1800/1900MHZ),and by message,internet or PDA, it can track ... in safeguarding vehicle,old,child,Pet,and managing personel; Track covertly etc. ... PDA with a free positioning server or a map software; And our ... the working mode). GPS DOG TRACKER COLLAR