Fi Series 3 Plus
Fi Series 3 Plus — product image.
8 strengths and trade-offs from our review coverage
Dimension scores carry one of three data source labels: manufacturer specifications, aggregated user reviews, or editorial assessment. No score is a hands-on measurement.
Final score is the weighted average of the dimension scores above — see How we score on /how-we-test/.
Brand: Fi · Category: GPS Trackers
Current price: check current price
no list price published — check retailer
no verified review count — check the retailer page
Available at Fi · How we make money
All-in-one GPS collar with up to three months of battery, saltwater-rated waterproofing and AI health insights.
Strengths & trade-offs
Summarized from our published coverage: Best GPS Tracker for Dogs: 5 Editor Picks.
What we like
- Up to 3 months of battery per charge — the longest published here
- IP68 and IP66K, fresh and saltwater rated to 50 meters
- AI health insights covering movement, sleep, diet, hydration and behaviors
- Fi Puppy Warranty swaps the collar free when a puppy outgrows it
What we don't like
- No collar price published on tryfi.com/collar, so year one cannot be totalled from the page
- Membership pricing is referenced, not listed, with only a one-month trial offered
- All-in-one collar means 24/7 wear is a prerequisite for the battery claim
- Longer app history sits behind the membership
| Type | All-in-one GPS smart collar |
|---|---|
| Battery | Up to 3 months |
| Charging | Wireless |
| Water resistance | IP68 + IP66K, 50 m fresh and saltwater |
| Build | Stainless steel frame, 500+ lbs resistance |
| Features | GPS tracking, activity, AI health insights |
| Lost-dog mode | Search Party |
| Fit | Modular, XS to XL dogs |
| Extras | LED night light |
| Subscription | Fi membership, 1-month trial offered |
Specifications from the manufacturer product record and retailer listings, verified 2026-11-07.
Frequently Asked Questions
Which dog GPS tracker has the longest battery life?
The Fi Series 3 Plus, at up to three months per charge with wireless charging. The Jiobit Smart Tag follows at up to 30 days, and Tractive's two weeks depends on Power Saving Zones. Source: Best GPS Tracker for Dogs: 5 Editor Picks
Which GPS tracker updates live location most frequently?
The Tractive DOG 6 publishes LIVE-mode location every 2-3 seconds; the Halo Collar 5 publishes 20 updates per second for fencing; the Jiobit reports every 10 seconds. Source: Best GPS Tracker for Dogs: 5 Editor Picks
Can a dog GPS tracker work without a subscription?
Not for live tracking at large. All five require a subscription for cellular location. The Life360 Pet GPS is the only one whose first year of service is bundled into the $99 device price. Source: Best GPS Tracker for Dogs: 5 Editor Picks
Are all five dog trackers waterproof?
Four publish a rating: Tractive IP68, Fi IP68 and IP66K to 50 meters, Life360 IP68 and Halo IP67. The Jiobit publishes no water-resistance rating on its official page. Source: Best GPS Tracker for Dogs: 5 Editor Picks
Compare with similar products
See how this product stacks up against the other products we cover in its category: maker-published specs, editor scores and verified prices, side by side.
Related coverage
Best ListBest GPS Tracker for Dogs: 5 Editor Picks
Five dog GPS trackers ranked on battery life, update frequency, water resistance, coverage and the real first-year subscription cost.