The additional PATHFINDER2 TRX GPS Collar for the expandable PATHFINDER2 GPS Dog Tracking and Training System. It features a 9-Mile tracking range and is equipped with a 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 seperately.