个人跟踪水平（加纳人口和健康调查，建立在军工委)

Features Real time tracking/SMS tracker GSM /SMS communication or GPRS TCP/UDP connection Work worldwide! Support 4-frequency GSM 850/900/1800/1900 MHz(Optional) High sensitivity, new technology and latest GPS SiRF-Star III chipset! Excellent for fixing the position even at a weak signal status. Work well even in areas with limited sky view like urban canyons Compact size, and smaller than one name card. Easy to hide Very Low power consumption Fast Signal Acquisition Monitors can track the person without interfering him LIVE! Real-Time tracking! Locate the locator holder by the mobile phone via SMS (short messaging system) SOS button send out exact location for immediate rescue/action Geo-fencing to restrict movement to a defined radius No monthly service charges to be paid to the call center Specifications C/A Code: 1.023 MHz chip rate Channels: 20 channel all-in-view tracking Time Accuracy: 1 ms synchronized to GPS time Default datum: WGS-84 Reacquisition: 0.1 sec, average Hot start: 1 sec, average Warm start: 38 sec, average Cold start: 42 sec, average Altitude Limit: 18,000 meters (60,000 feet) max. Velocity Limit: 515 meters/second (1000 knots) max. Acceleration Limit: Less than 4g Jerk Limit: 20 m/sec Operating temperature: -25 65degrees Humidity: 5% 95% Non-condensing Dimension: 76 * 46 * 25mm Charging connector: DC 5V (USB port) Standby time: more than 48 hours LED: 3 LEDs showing Power, GPS and GSM status, And other operation status color: black