Trying to decide between the Fi Mini, Fi Series 3+, and Fi Ultra? We’ve outlined the key differences below to help you choose the right fit for your pet’s lifestyle.
You can also take our quiz to find the tracker that best fits your needs!
Whichever Fi tracker you choose, you’ll get 24/7 escape alerts and real-time location tracking for your pet.
Recommendations
While the best product for you depends on your pet’s needs and your preferences, here are our recommended use cases for Fi Mini, Fi Series 3+, and Fi Ultra:
Fi Mini: Ideal for puppies, small dogs, and cats. This product is ideal for anyone looking for a lightweight option that attaches to most collars and harnesses.
Fi Series 3+: Designed for all adventure dogs. The Series 3+ is high-performance and provides AI-driven insights on your dog's behavior. Its durable, integrated design includes a collar band.
Fi Ultra: Our most advanced GPS tracker, built for dogs who explore remote areas or spend time in places with limited cell service. The Fi Ultra adds extended cellular coverage on the T-Mobile network plus satellite coverage, so you can stay connected even where standard cellular service is limited. The Fi Ultra is available for dogs in the United States only.
Want a full comparison of size, features, and more? Explore the chart below.
Comparison Chart
|
Series 3+ |
Fi Mini |
Fi Ultra |
|---|---|---|---|
| Sizing | 81.5mm x 30mm x 11.5mm |
42mm x 30mm x 12.5mm |
75mm x 40mm x 25mm |
| Weight | 47 grams |
16 grams |
68 grams |
| Comes with a Fi Base | Yes |
No |
No |
| Charging Method | Fi Base charging |
USB-C Charging |
USB-C Charging |
| GPS & Cellular Provider | AT&T |
Verizon |
T-Mobile |
| Night Light | Yes |
No |
No |
| Waterproof | IP68/66K |
IP68 |
IP68 |
| Battery Life | Up to 3 Months |
Up to 6 weeks |
2 to 3 days |
To see how Fi Mini, Series 3+, and Fi Ultra compare to earlier models, dive into our Fi Membership Features article for a full breakdown.