Fi Series 3 Dog Collar Device with collar NEVER Used THE WORLD’S MOST ADVANCED DOG COLLAR — Track your dog’s live location, activity, and sleep with your Series 3 device, collar, and Fi Membership. LIVE, ALWAYS-ON GPS TRACKING — Precision GPS tracking, works nationwide with no maximum range (unlike AirTags, which have a 200ft radius) and 24/7 service. ESCAPE ALERTS — Lost Dog Mode is triggered when your dog leaves a certain area, so you always know where they are and save valuable time if they get out. HEALTH + ACTIVITY INSIGHTS — Your dog's valuable health data, in your hands, Fi tracks and puts activity, sleep, and behavior into a context you can understand. App available on iOS and Android. DURABLE, DOG-FORWARD DESIGN — Sleek, stainless steel profile, 400-lb tug resistance, and IP68 and IP66K waterproof. It’s also easy to remove your tracking device from the collar to swap bands. UNBEATABLE BATTERY — Fi delivers up to 3-months of battery life on a single charge with included wireless charging base.