Track and train your dogs with Garmin’s Alpha TT25 Dog Collar. It comes equipped with a top-mounted, high-sensitivity GPS and Galileo receiver to keep track of your dog’s location via VHF up to 9 miles away with updates as frequent as every 2.5 seconds when used with a compatible handheld (sold separately). This collar features bright, multicolor LED beacon lights to help you identify and track your dog in low-light conditions. They can be remotely activated and changed from a compatible handheld device. In addition, the TT25 18 levels of continuous or momentary stimulation plus audible tone and vibration (when used with a compatible handheld)Features:9 mile range High sensitivity GPS and Galileo receiver 18 levels of continuous or momentary stimulationCompatible with: Alpha 10, Alpha 100, Alpha 200, Alpha 200i Alpha 300, Alpha 300i, Astro 430, and PRO 550 Plus handheld devices Garmin TT25 Tracking and Training Dog Collar 010-02447-20