$189.00
Best suited for
- Owners who take dogs on off‑leash hikes and trails (Fi lists off‑leash hiking and trail adventures as an intended use).
- Owners who need a live‑tracking Lost Dog Mode or Escape Alerts to locate a dog that bolts.
- Night walkers who want built‑in LED visibility integrated into the collar.
Poor fit for
- Owners who do not want or cannot maintain a subscription — cellular GPS tracking away from base stations requires an active Fi Membership subscription.
- People seeking a non‑electronic or no‑subscription basic collar.
- Buyers who need exact physical specs not provided here (weight, precise sizes) — verify size fit from manufacturer material before purchase.
Pros
- Integrated GPS/communication module with AT&T LTE‑M cellular plus GPS and additional Wi‑Fi and Bluetooth networking (manufacturer partnership with AT&T).
- Built‑in LED band for visibility and night walks.
- Battery life advertised up to 3 months per charge (varies with usage).
- Waterproof — rated for swimming and submersion.
- Tracking features include Lost Dog Mode (live GPS) and Escape Alerts, plus activity tracking.
Cons
- Requires an active Fi Membership subscription for cellular GPS tracking when the dog is away from home or base stations.
- Limited manufacturer warranty — coverage specifics require verification on tryfi.com.
- Battery life depends on use; stated figure is 'up to 3 months' and can vary.
Fi’s Series 3+ is a collar first. The GPS and communication module is built into a nylon collar band with an LED strip along it — no clip-on box — which changes what the product is: the tracker is always on the dog, in the same form factor as the collar it would have worn anyway.
The electronics stack, per Fi: GPS location over AT&T LTE-M cellular, with Wi-Fi and Bluetooth assisting near home. Features include Lost Dog Mode with live GPS, Escape Alerts when a dog leaves a safe area, and activity tracking.
Battery is the headline claim: up to three months per charge, with Fi noting the figure varies by usage — it assumes the dog spends most time home, where low-power modes do the work. The collar is waterproof and rated for swimming and submersion.
Two planning notes. Cellular GPS away from home requires an active Fi Membership subscription, so price the service into ownership, and confirm current warranty terms on tryfi.com. Second, multiple collar sizes exist; confirm sizing against your dog’s neck before buying.
Safety considerations
- Cellular GPS tracking away from home requires an active Fi Membership subscription — plan for subscription continuity if you rely on off‑site tracking.
- The collar is waterproof and rated for swimming and submersion; still confirm fit and secure attachment before aquatic activities.
- Multiple collar sizes are available; choose the correct size for a secure, comfortable fit.
- Verify current limited warranty coverage and terms on tryfi.com before purchase or extended use.
Verified specifications
- Fi
- Series 3+
- Collar with an integrated GPS/communication module and a built-in LED band
- Nylon collar band, Integrated electronic module
- Multiple collar sizes to fit a range of necks
Sizing & compatibility
Fit depends on your dog's measurements. Measure girth (the widest part of the ribcage) and consult the manufacturer's size chart before buying — a poor fit can cause chafing or let an escape-prone dog back out of the harness.