Simplify training and tracking of up to 3 dogs with the Garmin PRO 550 Plus Dog Training System. Boasting a 2-mile range, this Garmin dog tracking system uses GPS and GLONAS to show the direction your dogs are moving and how far away they are directly on the built-in display. A 2.5-second update rate lets you easily keep up with dogs on the run with a quick glance. 18 levels of continuous and momentary stimulation, tone, and vibration settings give you the ability to fine tune correction to provide only what's necessary. Handheld transmitter pairs easily with Garmin's TT 15 dog collar units for training and tracking or T 5 collar unit for tracking only (collars not included) . Simple-to-use switch lets you toggle between multiple dogs (collars not included), while a selection dial on top lets you easily select the stimulation level. Manufacturer model #: 010-02035-50. Expandable to up to 3 dogs 2-mile range GPS and GLONASS for accurate positioning 2.5-second update rate 18 levels of continuous and momentary stimulation, with tone and vibration settings as well Integrated display shows your dog's distance and direction of travel Pairs easily with TT 15 dog collar units for training and tracking or T 5 collar unit for tracking only (collars not included)