Process small amounts of content from server in the background can dramatically decrease battery life. ALJ GPS App is a real time GPS/GSM/GPRS tracking Application . User must choose any of the advanced ALJ Tracking devices to be installed in the vehicle, then you can use your ALJ GPS App to monitor it. iOS 4.0 or above is necessary in order to use Push notification service. Up to 10 tracking devices can be monitored at the same time.