Fi Series 3+ Smart Dog Collar — Research Review

Overview

The Fi Series 3+ Smart Dog Collar combines a nylon collar band with an integrated electronic GPS/communication module and a built‑in LED band. Fi positions this device for active, off‑leash use and for situations where live locating is important: the manufacturer’s stated intended uses include off‑leash hiking and trail adventures, travel with a dog prone to bolting, locating a lost dog via Lost Dog Mode, and night walks using the built‑in LED for visibility.

Connectivity and tracking

Fi’s documentation and support materials indicate the Series 3+ uses AT&T LTE‑M cellular plus GPS for location networking, augmented by Wi‑Fi and Bluetooth. The collar’s tracking feature set (as listed by the manufacturer/retailer) includes a Lost Dog Mode with live GPS, Escape Alerts to notify you if a dog leaves a safe area, and activity tracking. These features are enabled by the collar’s integrated communication module and the supported network stack.

Subscription requirement

Important for planning: Fi states that a Fi Membership subscription is required for cellular GPS tracking when the dog is away from home or base stations. If you depend on live location updates while offsite, factor the ongoing subscription into your decision and plans for continuity.

Battery and durability

The Series 3+ is advertised as offering up to three months of battery per charge; Fi and the product listing note that actual battery life varies with usage. For water exposure, the collar is listed as waterproof and rated for swimming and submersion, which supports use in wet conditions and aquatic scenarios.

Fit and materials

The collar uses a nylon collar band with an integrated electronic module. Fi offers multiple collar sizes to accommodate a range of necks; verify fit guidance and sizing options with the manufacturer or retailer before purchasing to ensure the collar sits securely and comfortably on your dog.

Warranty and where to buy

The product carries a limited manufacturer warranty; Fi advises verifying current coverage on tryfi.com. The Series 3+ is listed on Amazon (ASIN B0FH7SLFCH) as one retailer channel where it is available.

How this fits into your kit

If you need an integrated solution that pairs live tracking (AT&T LTE‑M + GPS) with visibility (built‑in LED) and robust water resistance, the Fi Series 3+ is explicitly designed for those use cases. Owners who prioritize live off‑site tracking should note the requirement for an active Fi Membership subscription. If you primarily want simple visibility at night without GPS, or if you want to avoid subscriptions entirely, a basic LED or reflective collar may be a simpler choice.

Bottom line

The Fi Series 3+ consolidates GPS tracking, cellular communications (AT&T LTE‑M plus GPS, with Wi‑Fi and Bluetooth), a long‑run battery (advertised up to three months depending on use), and a waterproof build into a single nylon‑band collar with a built‑in LED band. Its feature list targets off‑leash adventures, bolting behavior, and nighttime visibility, but cellular GPS outside of a home/base environment requires an active Fi Membership subscription. Verify sizing and the limited warranty terms on the manufacturer’s site before purchasing.