... personnel and Tracking criminals secretly.DetailsWorking Based on existing GSM/GPRS(850/900/1800/1900MHZ)network and GPS satellites, this product can locate ... SOS featuresSpecifications:Size: 80 x 60 x 25mmWeight: 100gNetwork: GSM/GPRSBand: 850, 900, 1,800 and 1,900MHzGSM sensitivity: less than 102dBmGPS ... % RH (non-condensing) GPS Tracker TK102 Mini Global Real Time GSM/GPRS/GPS Tracking Device