Kospet Tank T4: specs, who it fits and compatible phones
Kospet Tank T4 is a sport watch released in 2025 that works with iPhone and Android.
Specifications
| Release year | 2025 |
|---|---|
| Case size | 50 mm (approx.) |
| Display | AMOLED |
| Battery as listed | Up to 15 days (approx.) |
| Water rating | 10ATM (approx.) |
| GPS type | Dual-band GNSS |
| Operating system | KOSPET OS |
| Works with | iPhone and Android |
| Connection | No cellular connection |
| Plan needed | None |
| Health sensors | SpO2, Heart rate |
Who it fits
- Works with iPhone and Android.
Overview
The Tank T4 (2025) is Kospet's military-style running watch: dual-frequency GNSS with OPDR, 22 hours of continuous GPS, 20 MIL-STD-810H durability tests, and 3 dive modes, at a $182.99 official price.
What it does well
- Built to MIL-STD-810H across 20 tests: shock, temperature and humidity resistance documented to a standard, not just a marketing word.
- Dual-band GNSS plus OPDR (outdoor positioning dead reckoning) keeps tracks going when satellites drop out, with 22 hours of continuous GPS.
- 3 dive modes and 23 ApexMotion sport modes: it covers running, diving and training in one body.
- 10ATM water rating (approximate in our data).
- 32GB of onboard storage advertised for offline maps and music, per Kospet's page.
Tradeoffs to know
- Battery is listed at up to 15 days (approximate), and the 10ATM rating is also marked approximate.
- One large size (about 50mm): a big watch even by sport-watch standards.
- Whether the offline maps render on-wrist or are storage-only is not specified in the verified sources. Third-party app support was not verified for this model, and no supported payment wallet is verified.
Price and availability
$182.99 official price (list $209.99). Prices can change.
FAQ
Is the Tank T4 good for trail running?
Yes: dual-band GNSS with OPDR, 22 hours of GPS and MIL-STD-810H toughness are built for it. Kospet advertises 32GB for offline maps, though the verified sources do not specify how maps render on-wrist.
Can it dive?
It lists 3 dive modes with a 10ATM rating (approximate); that covers recreational diving features, not technical diving.
Which phones work with it?
Both iPhone and Android, through the companion app.
How it compares
Closest models from Kospet
| Model | Release year | Case size | Battery as listed | Water rating | GPS type | Works with |
|---|---|---|---|---|---|---|
| Kospet Tank M4 | 2025 | 52 mm (approx.) | Up to 15 days regular use | 10ATM · IP69K | Dual-band GNSS | iOS and Android |
| Kospet Tank M3 Ultra | 2024 | 53 mm (approx.) | Up to 15 days | 5ATM · IP69K | Dual-band GNSS | iOS and Android |
| Kospet Tank T3 Ultra 2 | 2024 | 51 mm (approx.) | 470mAh · 12 days · 30-35 GPS hours (approx.) | 5ATM · IP69K | Dual-band GNSS | iOS and Android |
Closest models from other brands
| Model | Release year | Case size | Battery as listed | Water rating | GPS type | Works with |
|---|---|---|---|---|---|---|
| Amazfit T-Rex 3 Pro | 2025 | 48 mm | 25 days (approx.) | 10ATM | Dual-band GNSS + maps | iOS and Android |
| COROS Apex 4 | 2025 | 42 / 46 mm | Up to 65 GPS hours (46 mm) (approx.) | 5ATM | Dual-band GNSS + maps | iOS and Android |
| COROS NOMAD | 2025 | 46 mm | Up to 22 days; 50 hours All-Systems GPS | 5ATM | Dual-band GNSS + maps | iOS and Android |
Compared with Kospet Tank M3 Ultra, Kospet Tank T4 lists a newer release year (2025 against 2024).
Compared with Kospet Tank T3 Ultra 2, Kospet Tank T4 lists a newer release year (2025 against 2024).
Only values listed exactly are compared.
Phone compatibility and plan
No plan is listed as needed.
Sensors and features are listed as the maker names them and are not medical measurements.
Related guides and lists
- Battery life explained
- Phone compatibility
- Water resistance ratings
- Sensors explained
- Kospet smartwatches
- All models
Last verified September 26, 2026
Features change with updates. Check the maker's current details. See our methodology