Fi vs. Halo Collar
Fi Series 3+, Fi Mini and Fi Ultra compared with the Halo Collar 5. Halo figures checked 2026-08-09 against Halo’s published specifications.
The short answer
These are different products aimed at different problems. Halo Collar 5 is a containment and training collar: it draws virtual fences and gives the dog sound, vibration or a static shock at the boundary. Fi is a tracker and health monitor — it alerts you, and never corrects the dog. On the published figures Fi Series 3+ is 47 g (1.66 oz) against Halo’s roughly 118 g (4.2 oz), runs up to 3 months against Halo’s 48 hours, and costs $189 for the first year against $644.
Specifications side by side
Every figure below comes from the manufacturer’s own published specifications.
| Specification | Fi Series 3+ | Fi Mini | Fi Ultra | Halo Collar 5 |
|---|---|---|---|---|
| Product type | GPS tracker and health monitor | GPS tracker and health monitor | Satellite-connected GPS tracker with recall | GPS containment and training collar |
| Device weight | 47 g (1.66 oz) | 16 g (0.56 oz) | 69 g (2.43 oz) | ≈ 118 g (4.2 oz) — retail listings; Halo does not publish a weight |
| Battery life | Up to 3 months | Up to 2 months | Up to 5 days | Up to 48 hours |
| Water resistance | IP68 / IP66K, salt-water tested | IP68, salt-water tested | IP68 / IP66K, salt-water tested | IP67 |
| Coverage | North America and much of Europe — 35 countries and territories | North America and much of Europe — 35 countries and territories | United States only — live GPS over cellular plus T-Satellite powered by Starlink | Major US cellular carriers (AT&T, Verizon, T-Mobile) |
| Containment | Unlimited geofences with 24/7 escape alerts | Unlimited geofences with 24/7 escape alerts | Geofences and escape alerts, plus Fi CallBack™ | Unlimited virtual fences 900 sq ft minimum |
| Feedback to the dog | None — Fi alerts the owner only | None — Fi alerts the owner only | Sound and vibration through Fi CallBack™ — no static shock | Sound, vibration and static electric shock |
| Cost, first year | $189 — one-year membership, device included | $189 — one-year membership, device included | $388 — $199 hardware kit plus a $189 one-year membership | $644 — $524 device plus $120 subscription |
| Try before committing | 30-day risk-free trial | 30-day risk-free trial | 30-day risk-free trial | Not Available |
| Health and behaviour | Activity, sleep, barking, scratching, licking, eating and drinking detection; AI vet records | Activity, sleep, barking, scratching, licking, eating and drinking detection; AI vet records | Smart vet records, walks and car rides | Logs walks and daily activity |
Where Fi is stronger
Weeks of battery instead of two days
Up to 3 months on Fi Series 3+ against up to 48 hours on Halo Collar 5.
Under half the weight
47 g (1.66 oz) for Fi Series 3+ against about 118 g (4.2 oz) for Halo, per retail listings.
Around a third of the first-year cost
$189 for Fi, membership and device included, against $644 — $524 for the device plus a $120 subscription.
Nothing is done to the dog
Fi’s geofences alert the owner. Halo’s boundary feedback includes static shock; if that is not something you want on your dog, that is a reason to choose differently.
Common questions
- Which costs less in the first year?
- Fi, by a wide margin — $189 for a one-year Series 3+ or Fi Mini membership with the device included, against $644 for Halo: $524 for the collar plus $120 of subscription. Fi Ultra sits between the two at $388.
- Which has the better battery life?
- Fi, on published figures, and the gap is large: up to 3 months for Series 3+ and up to 2 months for Fi Mini, against up to 48 hours for Halo. Fi Ultra is the exception on Fi’s side at up to 5 days. A containment collar has to run GPS and boundary detection continuously, which is the trade-off behind the shorter figure.
- Does Halo work outside the United States?
- Halo publishes coverage on the major US cellular carriers — AT&T, Verizon and T-Mobile. Fi Series 3+ and Fi Mini work across North America and much of Europe, 35 countries and territories. Fi Ultra is the exception on Fi’s side: it is sold in the United States only.
- Does Fi ever correct or shock the dog?
- No. Series 3+ and Fi Mini alert you, not the dog. Fi Ultra can play a sound and vibrate to call a dog back through Fi CallBack™, and that is as far as it goes — there is no static shock on any Fi device. Halo’s boundary feedback includes sound, vibration and static electric shock.
- Which is the better option for a small dog or a cat?
- Fi Mini, at 16 g (0.56 oz), and it attaches to a collar or harness you already own — which matters if your cat wears a breakaway collar. Halo is a full collar; retail listings put it around 118 g (4.2 oz), a figure Halo itself does not publish.
- Can I try either one before committing?
- Fi offers a 30-day risk-free trial on Series 3+, Fi Mini and Fi Ultra. Halo’s current return terms are worth checking on its own site before you buy, since those windows change.
What Fi owners say
Worth every single penny I paid for them and then some!
Tommy’s Dog Dad
I’ve had every version of the Fi collar, and it just keeps getting better!
Lola’s Dog Mom
We’re loyal to him because he’s loyal to us and he’s a part of our family… there’s no other better technology available.
Poppy’s Dog Dad
Ready to choose?
Every Fi membership includes a 30-day risk-free trial.