Application: 1. Valuables, medical equipment, power equipment, petro equipment 2. Special professional personnel, such as policemen, soldiers, prison administrators, security guard, etc. 3. Disadvantaged groups, such as elders, kids, patients, etc. 4. Outdoor-sports groups, such as go-abroad, traveling and exploring, etc. 5. Pets. Functions: 1. Tracking, the owners can exactly position the target by SMS, and get the data information of tiem, speed, direction, latitude & longitude, then check it with Google Earth. 2. SOS alarm 3. Over-speed alarm 4. Lock position, when the target moves more than 50m and last 15 seconds, the tracking device will send SMS to the set cellphone 5. Geo-fence alarm 6. Historical track playback 7. Positioning status display 8. Independent, small figure and convenient for use.