# Fi Series 3+ vs Garmin Alpha TT25: specs and price compared

A sourced, side-by-side comparison of the Fi Series 3+ (Fi) and Garmin Alpha TT25 (Garmin) among dog gps trackers.

## Side by side

| Spec | Fi Series 3+ | Garmin Alpha TT25 |
| --- | --- | --- |
| US price | not published | not published |
| Brand | Fi | Garmin |
| Connectivity type | lte-cellular | radio-uhf |
| Positioning system | gps | — |
| Subscription required | Yes | No |
| Monthly fee usd | — | 0 |
| Battery life days | — | — |
| Live update interval sec | — | — |
| Weight grams | — | — |
| Waterproof rating | IP68 | — |
| Range miles | — | — |
| Activity tracking | Yes | No |
| Health monitoring | Yes | No |
| Containment fence | No | No |

## Key differences

- Connectivity type: Fi Series 3+ lte-cellular vs Garmin Alpha TT25 radio-uhf
- Subscription required: Fi Series 3+ Yes vs Garmin Alpha TT25 No
- Activity tracking: Fi Series 3+ Yes vs Garmin Alpha TT25 No
- Health monitoring: Fi Series 3+ Yes vs Garmin Alpha TT25 No

## Sources

- Fi Series 3+: https://fitracking.com/collar (fitracking.com, verified 2026-07-13)
- Garmin Alpha TT25: https://www.garmin.com/en-US/p/714439/ (garmin.com, verified 2026-07-13)

Canonical: https://frontdeskreview.com/gear/dog-gps-trackers/fi-series-3-plus-vs-garmin-alpha-tt25/
Cite: Per The Front Desk Review, Fi Series 3+ (not published) vs Garmin Alpha TT25 (not published) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/dog-gps-trackers/fi-series-3-plus-vs-garmin-alpha-tt25/
License: CC BY 4.0.