Fi
Fi Series 3+ Smart Dog Collar
Fi Series 3+ combines a stainless, IP68 GPS collar with escape alerts, activity and behavior monitoring, and an LED—Fi membership is required for LTE tracking.
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Our review
Fi markets Series 3+ as a nationwide LTE and GPS collar that shows live location in the Fi app, with virtual safe zones that trigger escape alerts when your dog leaves. The hardware adds step counting, sleep and activity trends, and behavior flags like barking or licking, plus wireless charging and an onboard LED.
The collar is built around a stainless frame with IP68 waterproofing, meant for everyday wear on walks, swims, and yard time. Reviewers who accept the subscription praise tracking accuracy in open areas and the peace of mind from Lost Dog Mode’s faster updates when a pet is missing.
Every unit requires an active Fi GPS/LTE plan at activation—there is no free long-term tracking. Customer feedback is mixed on battery life (some report only a day or two versus marketing about multi-month life in safe zones), false escape alerts, and the need to keep Fi’s home base plugged in.
Pros and cons
What we like
- LTE/GPS tracking with escape alerts and Lost Dog Mode
- Activity, sleep, and behavior monitoring in the Fi app
- IP68 waterproof stainless collar with LED light
- Wireless charging stand included (listing)
What to watch
- Fi membership required—no tracking without a paid plan
- Mixed battery life reports versus safe-zone marketing
- False escape alerts and home base must stay plugged in
Specifications
| Connectivity | GPS + LTE (membership required) |
|---|---|
| Water rating | IP68 |
| Frame | Stainless steel |
| Battery | 285 mAh (listing) |
| Features | LED, wireless charging, Apple Watch app support |
| Warranty | 1 year (listing) |
Who it's for
- Escape-prone dogs when you will keep Fi membership active
- Owners who want health and activity logs with GPS
- Households that can charge and maintain the home base
The verdict
A full-featured cellular collar if you commit to Fi’s subscription and charging routine. Compare ongoing plan cost and battery reports before buying over a simpler GPS clip-on.
