Kospet Tank M4: specs, who it fits and compatible phones
Kospet Tank M4 is a sport watch released in 2025 that works with iPhone and Android. It lists Dual-band GNSS, 10ATM · IP69K and SpO2, Heart rate.
Specifications
| Release year | 2025 |
|---|---|
| Case size | 52 mm (approx.) |
| Display | AMOLED |
| Battery as listed | Up to 15 days regular use |
| Water rating | 10ATM · IP69K |
| Case material | Inox 360 stainless steel |
| 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.
- Lists an exact water rating of 5ATM or higher.
How it compares
Closest models from Kospet
| Model | Release year | Case size | Battery as listed | Water rating | GPS type | Works with |
|---|---|---|---|---|---|---|
| Kospet Tank T4 | 2025 | 50 mm (approx.) | Up to 15 days (approx.) | 10ATM (approx.) | 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 |
|---|---|---|---|---|---|---|
| COROS NOMAD | 2025 | 46 mm | Up to 22 days; 50 hours All-Systems GPS | 5ATM | Dual-band GNSS + maps | iOS and Android |
| Garmin tactix 8 Solar | 2025 | 51 mm | Up to 48 days with solar charging | 10ATM | Dual-band GNSS + maps | iOS and Android |
| Amazfit T-Rex 3 Pro | 2025 | 48 mm | 25 days (approx.) | 10ATM | Dual-band GNSS + maps | iOS and Android |
Compared with Kospet Tank M3 Ultra, Kospet Tank M4 lists a newer release year (2025 against 2024).
Compared with Kospet Tank T3 Ultra 2, Kospet Tank M4 lists a newer release year (2025 against 2024).
Compared with COROS NOMAD, Kospet Tank M4 lists a shorter listed battery (15 days against 22).
Compared with Garmin tactix 8 Solar, Kospet Tank M4 lists a shorter listed battery (15 days against 48) and Inox 360 stainless steel case material, where Garmin tactix 8 Solar lists Titanium.
Compared with Amazfit T-Rex 3 Pro, Kospet Tank M4 lists Inox 360 stainless steel case material, where Amazfit T-Rex 3 Pro lists Titanium.
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