Advantages 1) Slim, self-contained (built-in antenna and battery, weigh 120g), easy to hide and carry 2) Low consumption, long standby of 3 - 150 days (depends on the working mode) 3) Warn covertly, listen in remotely 4) Automatically and conveniently search: use the public positioning server to search the target position via text message and internet Parameters: 1) GPS chip: American U-Nav chip 2) Channel: 16 3) Sensitivity: search-147dBm, track-158dBm 4) Precision: 5m outdoors 5) Positioning time: hot status: 12s, cold status: 48s 6) Battery charging: on car: input-12V, output-5V; on travel: output-5V, 500mA 7) Chargeable/changeable Li battery: 3.7V 400mAh Applications: 1) Safeguards against theft of vehicle, equipment 2) Protects and monitors the old, disabled, children and pets 3) Provides peace-of-mind for businessman 4) Manages on-business personnel 5) Secretly tracks criminals