IES GPS System is a real time GPS/GSM/GPRS tracking service. Continued use of GPS running in the background can dramatically decrease battery life. User must choose any of the advanced IES Tracking devices to be installed in the vehicle, then you can use your IES GPS System 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.