Garmin's T5 Dog Collar is equipped with a high-sensitivity GPS/GLONASS and can track the exact position of your dog within a 9 mile radius. Its water proof up to 10 meters and features a LED beacon light for locating your dog in low light conditions. Compatible Handheld Devices: Alpha 100Alpha 200iAstro 320Astro 430PRO 550 Plus Garmin T5 GPS Dog Collar 010-01041-70