Basic Functions: 1. GPS + GSM + GPRS wireless communication network positioning system. 2. Intelligent startup GPS positioning. 3. Mobile phone functions. 4. Hands-free phones function. 5. Voice surveillance function, can monitor sound of field and dialogue. 6. Battery low power notice (SMS and platform). 7. Setting three specific numbers for SOS alarm. 8. Setting 4 family numbers for quick dialing;. 9. Accept instruction through SMS, get the location information, 10.Setting Humanization work time of GPS, standby time longer. Characteristics: 1.children's safety, grasps the whereabouts; 2.Old safety, preventing lost;; 3.Business people, safety precautions; 4.Outworkers, bail personnel management, tracking and protection, also used for travelers, assembly, and field lovers etc. Through positioning service platform, more convenient, more humanization. Specifications: GSM:900/1800MHz GPRS:Class2,TCP/TP build in GSM Module GPS:u-blox AMY-5M LCD:1.5* TFT 2.6 MEGA color and touch screen Tracking sensitivity: -160dBm Capturing sensitivity:-143dBm Positioning time: Hot start:<1sec (Open Sky); Warm start:<32sec; Cold start:<35sec(Open Sky); antenna:GSM,GPS built-in antenna function key:switch on/off,SOS battery:3.7vDC/800mAh Standby time:120h holding time:3.5h GPS tracking:48h(Interval for 30 minutes) Weigh:52g Size:65.0(L)* 44.5(W)* 18.0(H)mm Working temperature:-20℃ to +60℃