3 available all new Small yellow or grey Medium pink Asking 80 Features & details GPS TRACKING - Harness the power of GPS and LTE-M Cellular Networks to remotely track your dog anywhere in the US 24/7. See your dog’s location history and view all yours or your dog walkers previous walks with your pup. ESCAPE ALERTS - Get alerts sent to your phone immediately if your dog ever gets out unexpectedly. Fi uses proprietary algorithms to detect when your dog escapes from your backyard. It is the fastest, most accurate way to be notified when your dog escapes and to find your dog after an escape. ACTIVITY MONITORING - Keep your dog in the best shape of their life. Track their steps and exertion level and compare them to other dogs of the same breed and in your neighborhood. UNMATCHED BATTERY LIFE - Put it on your dog and forget about it, with up to 3 months between charges. SIZES/COLORS - Our collars comfortably fit dogs with necks between 11.5”-34.5” and come in four core color options (yellow, gray, blue, pink) but there are dozens of other designs available thanks to our third party Fi Makers partners!