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We are offering gps watch phone. Content specificationgsm module gsm 850/900/1800/1900 mhz quad frequencygps sensitivity -163dbmgps center frequency l1, 1575.42mhzgps positioning accuracy 5-25mgsm positioning accuracy 100-500mspeed accuracy 0.1 m/stime accuracy synchronous with gpsgps datum wgs-84hot start < 1swarm start < 38smax. Altitude 18000mmax. Speed 515m/sgravitational acceleration < 4goperating temperature -20c---65chumidity 5%---95%dimensions 64.5(l) x45.5(w) x17.5(h) mm (main unit)weight 82gvoltage rechargeable 450mah batterypower supply dc5vstandby time 48hbuttons sos button for emergency aid; call 1, call 2, switch on / off buttons, interface switch button.