The new PATHFINDER2 series is not compatible with previous generation PATHFINDER series systems.CUT EM' LOOSE: The PATHFINDER2 ADDITIONAL RECEIVER is an add on receiver for the PATHFINDER2. Dogtra's PATHFINDER2 is a complete GPS tracking system with the enhanced Dogtra PATHFINDER2 real time tracking and training app. Explore more and track up to 21-dogs in real time with Dogtra PATHFINDER2. The new PATHFINDER2 is NOT compatible with PATHFINDER series. E-COLLAR FUNCTION BUTTON: The new PATHFINDER2 GPS Connector* allows for direct corrections for a quicker response. You have e-Collar command from both the GPS Connector or in app on your smartphone or smartwatch. PATHFINDER2 GPS Connector & Smartphone are required to operate. *PATHFINDER2 GPS Connector is not included and is required to operate. SMARTWATCH COMPATIBLE: Smart watch users can now track their dogs from their smartwatch with quick access to the extended PATHFINDER2 dog tracking app that is available for Apple Watch Series 5 and Galaxy Watch4 Series and above. 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. Offline Maps allow you to save and download maps to be made available in offline mode. Maps provide useful marker settings, notifications, and icons giving you confidence on any adventure. MORE CORRECTION MODES: PATHFINDER2 ADDITIONAL RECEIVER offers Nick, Constant, and Audible tone, along with the new LED Locate Light and Pager Vibration. PATHFINDER2 also provides battery saving sleep mode, lost collar locator and lock so you can protect your investment. PATHFINDER2 offers the new GPS Connector*, featuring an e-collar function button and 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. *PATHFINDER2 GPS Connector not included. Pager Vibration & LED Locate LightIn addition to Nick, Constant, and Audible Tone corrections, the PATHFINDER2 GPS Receiver now offers Pager Vibration & LED Locate Light allowing you to see your dogs in low visibility conditions. PATHFINDER2 is a fully waterproof system with an IPX9K rating, meaning it's ready for the most demanding environments.