Garmin Instinct E 45mm: specs, who it fits and compatible phones
Garmin Instinct E 45mm is a sport watch released in 2025 that works with iPhone and Android. It lists Standard GPS, 10ATM and Chemically strengthened glass.
Specifications
| Release year | 2025 |
|---|---|
| Dimensions | 45×45×14.2 mm |
| Display | MIP |
| Battery as listed | Up to 16 days · 24 GPS hours |
| Water rating | 10ATM |
| Glass | Chemically strengthened glass |
| Case material | Fiber-reinforced polymer |
| GPS type | Standard GPS |
| Operating system | Garmin OS |
| Works with | iPhone and Android |
| Connection | None |
| Plan needed | None |
| Health sensors | SpO2, Heart rate, HRV |
| Safety features | SOS |
Who it fits
- Works with iPhone and Android.
- Lists SOS or fall detection, see our guide for older adults.
- Lists an exact water rating of 5ATM or higher.
How it compares
Closest models from Garmin
| Model | Release year | Case size | Battery as listed | Water rating | GPS type | Works with |
|---|---|---|---|---|---|---|
| Garmin Forerunner 165 | 2024 | - | Up to 11 days · 19 GPS hours | 5ATM | Standard GPS | iOS and Android |
| Garmin Forerunner 570 | 2025 | 42 / 47 mm | Up to 10 days (47 mm) | 5ATM | Dual-band GNSS | iOS and Android |
| Garmin Forerunner 970 | 2025 | 47 mm | Up to 15 days | 5ATM | Dual-band GNSS + maps | iOS and Android |
Closest models from other brands
| Model | Release year | Case size | Battery as listed | Water rating | GPS type | Works with |
|---|---|---|---|---|---|---|
| Blackview W80 Pro | 2024 | 48 mm (approx.) | 900mAh · over 15 days · 60 standby | IP68 (approx.) | Standard GPS | iOS and Android |
| 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) | 5ATM | Dual-band GNSS + maps | iOS and Android |
Compared with Garmin Forerunner 165, Garmin Instinct E 45mm lists a higher ATM rating (10 against 5) and a newer release year (2025 against 2024).
Compared with Garmin Forerunner 570, Garmin Instinct E 45mm lists single-band GPS, where Garmin Forerunner 570 lists dual-band, a higher ATM rating (10 against 5) and Fiber-reinforced polymer case material, where Garmin Forerunner 570 lists Polymer/aluminum.
Compared with Garmin Forerunner 970, Garmin Instinct E 45mm lists single-band GPS, where Garmin Forerunner 970 lists dual-band, a higher ATM rating (10 against 5) and Fiber-reinforced polymer case material, where Garmin Forerunner 970 lists Titanium bezel.
Compared with Blackview W80 Pro, Garmin Instinct E 45mm lists a newer release year (2025 against 2024).
Compared with Amazfit T-Rex 3 Pro, Garmin Instinct E 45mm lists single-band GPS, where Amazfit T-Rex 3 Pro lists dual-band, Fiber-reinforced polymer case material, where Amazfit T-Rex 3 Pro lists Titanium and Chemically strengthened glass glass, where Amazfit T-Rex 3 Pro lists Sapphire.
Compared with COROS Apex 4, Garmin Instinct E 45mm lists single-band GPS, where COROS Apex 4 lists dual-band, a higher ATM rating (10 against 5) and Fiber-reinforced polymer case material, where COROS Apex 4 lists Grade-5 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
- Garmin smartwatches
- All models
Last verified September 26, 2026
Features change with updates. Check the maker's current details. See our methodology