Ruptela(Lithuania) FM-Eco4 light gps tracker is designed for vehicle tracking and monitoring speed, location, trip history, mileage, fuel level, etc. The FM-Eco4 gps tracker has an internal GPS & GSM antenna so it is small and very easy installed.
The FM-Eco4 tracker communicates using GSM (2G) networks, and it is also available in version that supports UMTS (3G).
It uses Ublox EVA-M8M Module:
So it may have two operating frequencies:
1. GSM (2G) network+GPS: High possibility.
You can use this 2G GPS jammer to block it: http://www.jammer4uk.com/gps-and-cell-phone-jammer-j220b-p-17.html
2. GSM (2G) network+UMTS (3G)+GPS: Low possibility.
You can use this 2G 3G GPS jammer to block it: http://www.jammer4uk.com/portable-cell-phone-gpsl1-jammer-p-26.html