Amazfit
Device summary
Polar
Street X
Full specifications
| Basic information | ||
|---|---|---|
| Release year | 2025 | 2026 |
| Starting price | — | $250 |
| Display size | 1.3-inch | 1.3-inch |
| Dimensions | 44.8 mm × 44.8 mm × 13.2 mm | 45.0 mm × 45.0 mm × 13.8 mm |
| Weight | 47 g | 28 g |
| Front material | — | Corning Gorilla Glass 3 |
| Back material | — | Bio-based plastic |
| Display | ||
| Display technology | AMOLED | AMOLED |
| Resolution | 466 × 466 | 416 × 416 |
| Peak brightness | 3000 nits | — |
| Protection | Sapphire | Corning Gorilla Glass 3 (AF + DLC coating) |
| Performance | ||
| Expandable storage | No | No |
| Battery & charging | ||
| Charging standard | Magnetic charging | Proprietary / USB-C. Smartwatch mode up to 10 days; performance training (GPS + HR) up to 43 h; eco training up to 170 h (power-save — not everyday life). Complete watch 48 g with wristband; body 28 g without. On-device storage 32 MB |
| Battery type | Lithium-ion | Li-Pol (385 mAh) |
| Rated capacity | 500 mAh | — |
| Connectivity | ||
| Cellular | GPS / multi-GNSS | GPS / Galileo / BeiDou / QZSS (single-frequency; no dual-frequency GNSS), Route guidance; compass; barometer, Precision Prime™ OHR GEN 3.5; skin temp GEN 1 (no ECG / SpO2 / Elixir suite), Integrated LED flashlight (white / red), Polar Flow |
| Wi‑Fi | Wi-Fi | — |
| Bluetooth | Bluetooth | Bluetooth® LE |
| Build & durability | ||
| Frame | Fiber-reinforced polymer / Grade 5 titanium bezel | Bio-based plastic (PA11+8GF); aluminum; stainless steel |
| Ingress protection | 10 ATM | WR50 (50 m); MIL-STD-810H |
| Basic information | ||
|---|---|---|
| Release year | 2025 | 2026 |
| Starting price | — | $250 |
| Display size | 1.3-inch | 1.3-inch |
| Dimensions | 44.8 mm × 44.8 mm × 13.2 mm | 45.0 mm × 45.0 mm × 13.8 mm |
| Weight | 47 g | 28 g |
| Front material | — | Corning Gorilla Glass 3 |
| Back material | — | Bio-based plastic |
| Display | ||
| Display technology | AMOLED | AMOLED |
| Resolution | 466 × 466 | 416 × 416 |
| Peak brightness | 3000 nits | — |
| Protection | Sapphire | Corning Gorilla Glass 3 (AF + DLC coating) |
| Performance | ||
| Expandable storage | No | No |
| Battery & charging | ||
| Charging standard | Magnetic charging | Proprietary / USB-C. Smartwatch mode up to 10 days; performance training (GPS + HR) up to 43 h; eco training up to 170 h (power-save — not everyday life). Complete watch 48 g with wristband; body 28 g without. On-device storage 32 MB |
| Battery type | Lithium-ion | Li-Pol (385 mAh) |
| Rated capacity | 500 mAh | — |
| Connectivity | ||
| Cellular | GPS / multi-GNSS | GPS / Galileo / BeiDou / QZSS (single-frequency; no dual-frequency GNSS), Route guidance; compass; barometer, Precision Prime™ OHR GEN 3.5; skin temp GEN 1 (no ECG / SpO2 / Elixir suite), Integrated LED flashlight (white / red), Polar Flow |
| Wi‑Fi | Wi-Fi | — |
| Bluetooth | Bluetooth | Bluetooth® LE |
| Build & durability | ||
| Frame | Fiber-reinforced polymer / Grade 5 titanium bezel | Bio-based plastic (PA11+8GF); aluminum; stainless steel |
| Ingress protection | 10 ATM | WR50 (50 m); MIL-STD-810H |
Key differences
The most meaningful measured gaps in size and weight — not an overall winner.
Weight
Street X
19 g lighter
Thickness
Amazfit T-Rex 3 Pro 44mm
0.6 mm thinner
Height
Very similar height
Width
Very similar width
What these size differences mean
Calculated from the dimensions shown, rounded to 0.1 mm and 1 g. Percentages use the smaller measurement as the reference. Fold and rotation settings affect the dimensions compared.
- Street X is 0.2 mm (0.4% relative to Amazfit T-Rex 3 Pro 44mm) wider. Check this difference against the width of your current device and pocket opening.
- Street X is 0.2 mm (0.4% relative to Amazfit T-Rex 3 Pro 44mm) taller. This describes the body outline; screen diagonal alone does not tell you the overall size.
- Street X is 0.6 mm (4.5% relative to Amazfit T-Rex 3 Pro 44mm) thicker. Cases and camera protrusions can change the clearance you need.
- Street X is 19 g lighter. This is the listed device-weight difference, not a measured comfort rating.
Use these figures to compare physical size. They do not establish one-handed reach, pocket fit, durability or an overall winner.
Sources and measurement notes
Sizometry compares published specifications and calculates differences. These are not hands-on measurements or tests of comfort, performance or pocket fit.
Amazfit T-Rex 3 Pro 44mm
Check the exact model, year, region and configuration on the linked page. References may cover several variants. Folded and unfolded dimensions differ; cases and camera protrusions may change the space a device needs. Drawings share a relative scale and are not calibrated to life size on your screen.