"Add to your Dogtra PATHFINDER2 GPS Dog Tracking and Training System (not included) with this Dogtra PATHFINDER2 Mini TRX GPS Collar. The PATHFINDER2 Mini is 22% smaller than the original collar, fitting dogs with a minimum neck size of 12.5"" and at least 15 lbs. This collar features an LED locate light and both a GPS and MURS band antennas to help you track your dog for up to 4 miles. Compatible with the free PATHFINDER2 app. This electronic dog training collar has a pager vibration, sleep mode, tracking-only mode, various fencing modes, and nick/constant stimulation as well as an audible tone. The PATHFINDER2 GPS Connector (not included) required to operate collar. System is expandable to 21 dogs. 22% smaller than the original PATHFINDER2 collar LED locate light and audible tone GPS tracker and MURS band antenna Tracks up to a 4-mile range Nick/constant/pager vibrations Tracking-only and sleep modes Built for minimum 12.5"" neck size and dogs 15 lbs. and up Requires PATHFINDER2 GPS Connector (not included)"