Do not return the data through the operator GPRS is simply relying on the GPS locator to transfer data, if there are many GPS locator, how to know that locator is what you want,For example, A has a GPS locator body, A home must have a receiving device. In addition B had a B locator, the home also has a receiving device, receiving device is how to know B A's or B's body. A similar pair, do you understand
It is only in a certain range (such as 10km) using the short distance wireless communication, which does not require the support of GPRS, like a battlefield combat squad is much too far away? Only with high power directional antenna or satellite antenna.
It is only in a certain range (such as 10km) using the short distance wireless communication, which does not require the support of GPRS, like a battlefield combat squad is much too far away? Only with high power directional antenna or satellite antenna.
It is only in a certain range (such as 10km) using the short distance wireless communication, which does not require the support of GPRS, like a battlefield combat squad is much too far away? Only with high power directional antenna or satellite antenna.
