RGT90 connects to satellites and local cellular networks to provide accurate GPS Coordinates and street addresses*. The RGT90 comes with a PRE-ACTIVATED SIM CARD with 6 months of GPRS cellular service and 6 MONTHS of Online Tracking Subscription. Just Insert the SIM card and your GPS Tracker is up and running, ready to use. The internal battery has a 90 Hour Runtime battery life per charge (1hr of drivetime per day can yeild 90 Days of life per charge). The RGT90 works 2 ways. UNLIMITED SMS TEXT MONITORING or UNLIMITED LIVE REAL-TIME WEB TRACKING. SMS TEXT MONITORING: When you want to locate the tracker, text the GPS tracker and it will send you a text message with the tracker's location information to your smart phone. Just click the text message with a Google map link sent to your smart phone and it will open and show the tracker current location. LIVE REAL-TIME WEB TRACKING (20sec Update): The RGT90 connects to satellites and local cellular networks to send GPS tracking coordinates to our servers. Our servers connect to a Google Maps GUI interface that you can use to see the current position and history of your GPS tracker. The RGT90 GPS tracker will arrive with Pre-configured login ID and Password to login to our GPS tracking server to view the tracker current location and history log. 6 Months Free tracking service: No GPS Tracking subscription required. After this 6 Months free tracking subscription, It will cost customer $10/month for continuously use our online tracking service FEATURES: US Based Tech Support. Reach a human nearly 24/7!! Detailed Address logging. Logs and saves all starts and stops. Each trackers is 100% tested in The US before shipping. Pre-activated SIM card with 6 Months of Cellular service and Online Tracking sub. included. 2.5 meters/ 8ft Accuracy.