... Tracker is base on the GPS satellites and GSM(850/900/1800/1900MHz), and by message, internet or PDA, it can track ... /: 600g (with all accessories) Network: GPRS(CMNET) Band: 900/1800MHz or 850/900/1800/1900MHz GPS chip: SIRF3 /U-Blox5 GPS sensitivity: -159dBm ...