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Overview: Working Based on existing GSM/GPRS network and GPS satellites, this product can locate and monitor any remote targets by SMS or internet. The most advanced technology of GPS and GSM dual positioning. Function: 1.Long Standby Time It has built-in 3.7V 1000mAh Li-ion battery, can standby up to 400 hours. 2.Remotely Voice Monitor Send “Monitor+Password” [...]