The new PATHFINDER2 series is not compatible with previous generation PATHFINDER series systems. CUT EM LOOSE: The PATHFINDER2 TRX ADDITIONAL RECEIVER is a GPS only tracker with the enhanced Dogtra PATHFINDER2 real time tracking app. Explore more and track up to 21-dogs in real time with Dogtra PATHFINDER2. The new PATHFINDER2 is NOT compatible with PATHFINDER series. UKC, AKC, and PKC APPROVED: This GPS tracking collar is perfect for working, hunting, or competitive situations and is approved for UKC, AKC, and PKC events, because there is no correction output on this GPS-only tracking collar. Dogtra is the Official GPS Collar Partner of UKC . The smartwatch app features access to your GPS receiver, Compass, e-Collar commands, and Maps that provide precise location information. FREE APP, FREE MAP: No Subscriptions Required and No Monthly Fees. Map views include General, Satellite, and Terrain views. Free maps are powered by Map Box. Maps provide useful marker settings, notifications, and icons giving you confidence on any adventure. NO CORRECTION: Dogtras PATHFINDER 2 TRX tracking collar does not come with any correction and provides easy location sharing for dogs and dog owners. It comes with a LED Locate Light and is fully IPX9K waterproof. PATHFINDER2 also provides battery saving sleep mode, lost collar locator and lock so you can protect your investment. PATHFINDER2 TRX ADDITIONAL RECEIVER is a GPS tracking only add on receiver for the new Dogtra PATHFINDER2 Tracking and Training system. It is competition ready for UKC, AKC, and PKC events. It features precise smartwatch control, to maximize the mobility and minimize the interruption during your tracking. The new PATHFINDER2 made updates across the board, including additional correction modes, free Mapbox maps, e-collar control via app and smartwatch, enhanced GPS fences, sleep mode, Bluetooth range alert, and many more features. PATHFINDER2 requires No Monthly fees or subscriptions. GPS Connector Required to Operate and is not included. Specifications Color: Blue. Weight: 3 lbs.