The Fi Series 3+ is an AI-powered GPS smart collar and health monitor for dogs, combining real-time location tracking with comprehensive behavioral health insights in a single durable device. It connects via AT&T LTE-M network with GPS satellite support for unlimited nationwide range, featuring Lost Dog Mode, customizable virtual geofences, and instant escape alerts when your dog leaves a safe zone.

The collar is built with an industrial-strength stainless steel frame rated to withstand 400–500 lbs of tug force and is IP68/IP66K certified waterproof up to 50 meters, making it fully submersible for swimming and all-weather use. Battery life reaches up to 3 months with wireless charging via the included base station.

Fi's AI-powered health monitoring engine tracks a wide range of behaviors including activity, rest, eating, drinking, licking, scratching, and barking. The Fi app analyzes these patterns against breed- and age-specific baselines to surface personalized health insights. It also includes sleep pattern analysis, shareable smart vet records, Apple Watch integration, and walk tracking with activity recommendations. The Costco bundle includes a 14-month membership subscription.