The additional PATHFINDER2 TRX GPS Collar for the expandable PATHFINDER2 GPS Dog Tracking and Training System. It features an 8 km tracking range (5-mile tracking range) and is equipped with an LED Locate Light and is fully waterproof. The PATHFINDER2 TRX GPS Collar is a tracking-only collar and does not include contact points nor feature e-collar functions. Users can pair up to 21 dog collars to the PATHFINDER2 system. This GPS dog tracking-only collar requires the PATHFINDER2 GPS Connector in order to operate. The PATHFINDER2 TRX GPS Collar is approved for use in AKC, UKC, and PKC events. Additional Information: PATHFINDER2 TRX is a tracking-only collar. Does not feature e-collar functions or contact points. PATHFINDER2 GPS Connector required to operate and is sold separately. Compatibility: Only PATHFINDER2 Series, PATHFINDER2 App, PATHFINDER2 GPS Connector Watch PATHFINDER2 Video Tutorials HERE