AI Life / Family & Pets / GPS Collars
The Fi Series 3+ is a slim GPS collar that uses LTE-M cellular to report where your dog is, alert you when it leaves a safe zone, and track activity and sleep. A membership is required.
I have not owned the Fi Series 3+. This review is built from the maker’s published specs and independent reviews, linked below. For more picks, see the GPS Collars hub .
Key specs
| Fi Series 3+ | |
|---|---|
| Connectivity | GPS, LTE-M, Wi-Fi base |
| Features | Safe zones, Lost Dog Mode, activity, sleep, behavior |
| Battery | Weeks; owners report about 3 to 4 weeks, per Kris Richardson |
| Coverage | US cellular |
| Subscription | Required |
Sources: Kris Richardson , Rebarkable , GPS Dog Trackers .
What reviewers like
- Long battery compared with most GPS trackers.
- Fast escape alerts.
- Slim build on a collar.
What to watch for
- Subscription required.
- US coverage only.
- Occasional false safe-zone alerts.
Who should buy it
Buy it if your dog is an escape artist and you are in the US. Skip it for tiny dogs or if you avoid subscriptions.
GPS trackers and cellular plans
GPS trackers use a satellite fix to find your pet and a cellular connection to send the location to your phone, which is why most need a plan. Coverage matters: check the map where you live and walk. Battery life drops fast in live tracking mode. Charge before hikes and trips.
Fit and comfort on the collar
GPS trackers add weight to the collar. For small dogs, check the device weight against the maker’s minimum dog size and make sure the collar sits snug enough that the tracker does not swing. Waterproofing matters for dogs that swim; check the rating before a beach trip.
Safe zones and false alerts
Safe zones work best when they are larger than your yard, because GPS can drift a few meters, especially near buildings and trees. If you get false escape alerts, widen the zone or add your home Wi-Fi or base station as a trusted location. Test the alert by walking your dog past the boundary once before you rely on it.
Cats versus dogs
Most GPS trackers are designed for dogs. Cat versions exist but are smaller, with shorter battery. Cats also roam in places GPS struggles, like under decks and inside sheds.
How I research these reviews
For products I have not owned, I read the maker’s published specs and support pages, then cross-check them against several independent reviews and, where I can, owner reports. When sources disagree, I say so. I do not list prices because they change constantly. Sources for each claim are linked under the specs table.
Before you buy checklist
Check four things before checkout. First, the phone: some health devices only work fully with one platform, so confirm yours is supported. Second, ongoing costs: memberships, sensors, replacement heads, litter and cloud video plans can cost more over a few years than the device itself. Third, privacy: read what data the app collects, whether it is stored in the cloud, and whether you can export or delete it. Fourth, returns: holiday purchases often get extended return windows, so set a reminder to decide before yours closes.
A note on health claims
Consumer health gadgets are wellness tools unless the maker says a specific feature is cleared by the FDA. Treat scores and estimates as trends, not diagnoses, and talk to a doctor about anything that worries you. None of this page is medical advice.
Is the Fi Series 3+ on sale for Black Friday?
It is one of the products I am watching this season. I do not list sale prices here because they change by the hour and differ by color, bundle and store. Compare against the price you see in the weeks before the sale, and check whether a bundle adds things you will not use.
Our take
AI Score note: research-based, not hands-on. The strongest US pick for escape alerts and battery, plus a membership. This is my editorial read of published reviews, not a rating.
Check today’s price before you buy: See the Fi Series 3+ at Fi .
Compare
See Fi vs Tractive , or browse the pet and baby tech deals for Black Friday .