... to +55°CHumidity5%--95% non-condensingBased on the GPS satellites and GSM(850/900/1800/1900MHZ),and by ... message,internet or PDA, it can track and position various remote targets.Locate precisely, Be ... in safeguarding vehicle,old,child,Pet,and managing personel; Track covertly etc.Advantages:1. Locate conveniently: with our ... -15 days (depend on the working mode). GPS DOG TRACKER COLLAR