Expand your pack and keep track of it with the Dogtra Pathfinder2 GPS Dog Tracking and Training System Add-On Receiver Collar. Training functions include a rheostat/volume dial with 0-100 levels; nick and constant stimulation; non-stimulating pager vibration; and audible tone. The e-collar also comes equipped with a waterproof receiver and a LED Locate Light. Compatible only with the Pathfinder2 system (not included). Manufacturer model #: PATHFINDER2 ADD. Additional collar for the Pathfinder2 tracking and training system (not included) Rheostat/volume dial with 0-100 levels Nick and constant stimulation Non-stimulating pager vibration Audible tone Waterproof e-collar receiver LED Located Light