Amazfit Bip U Pro vs Amazfit Smartwatch 2 ECGSize, Specs & Wrist Fit Compared
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Amazfit
Bip U Pro
Amazfit
Smartwatch 2 ECG
Which one fits you
On wrists narrower than about 43mm, the Amazfit Smartwatch 2 ECG is the safer pick — it stays proportionate down to roughly 37mm, where the Amazfit Bip U Pro starts to hang over the edge. Above 43mm both sit cleanly, and the Amazfit Bip U Pro gives you more presence.
The Amazfit Bip U Pro and Amazfit Smartwatch 2 ECG share a near-identical 35.5mm case, so wrist presence comes down to thickness, lug-to-lug and weight.
The Amazfit Bip U Pro is the slimmer of the two (11.4mm vs 13.7mm), so it slides under a cuff more easily.
On the wrist the Amazfit Bip U Pro feels lighter (31g vs 49g, case only).
Among the 109 36mm watches we hold thickness for, the Amazfit Bip U Pro is thicker than 76% — it will sit high even though the case width reads modest.
Among the 105 35mm watches we hold thickness for, the Amazfit Smartwatch 2 ECG is thicker than 96% — it will sit high even though the case width reads modest.
Specification Comparison
| Spec | AmazfitBip U Pro | AmazfitSmartwatch 2 ECG |
|---|---|---|
| Case Width | 35.5mm | 35.4mm |
| Lug-to-Lug | 40.9mm | 35.4mm |
| Thickness | 11.4mm | 13.7mm |
| Weight | 31g | 49g |
| Shape | Rectangle | Circular |
| Water Resistance | 5 ATM | Waterproof |
| GPS | Yes | Yes |
| Display | 1.43 inches | 1.39 inches |
| Always-On Display | No | No |
| Charge time | 2 hours | 1.5 hours |
| Battery life | 9 days | 5 days |
| Battery power | 230 mAh | 420 mAh |
| Has wireless charging | No | No |
| Has a removable battery | No | No |
| Has a solar power battery | No | No |
| Has a rechargeable battery | Yes | Yes |
| Has a battery level indicator | Yes | Yes |
| Released | 2021 | 2019 |
Battery life compared
The two are closest in everyday use and furthest apart in Smartwatch mode, where one lasts 1.8× as long as the other (9 days against 5 days).
Amazfit Bip U ProAmazfit Smartwatch 2 ECG
Smartwatch
9 days5 days
Full Specification Comparison
116 specs| Spec | Amazfit Bip U Pro | Amazfit Smartwatch 2 ECG |
|---|---|---|
| Design | ||
| width | 35.5 | 35.4 |
| height | 40.9 | 35.4 |
| volume | 16.55 cm³ | 17.17 cm³ |
| weight | 31 g | 49 g |
| thickness | 11.4 | 13.7 |
| ATM rating | 5 ATM | — |
| resolution | 302 x 320 px | 454 x 454 px |
| screen size | 1.43 inches | 1.39 inches |
| Display type | LCD | OLED/AMOLED |
| Has a display | Yes | Yes |
| pixel density | 307.7 ppi | 462 ppi |
| width of band | 20 mm | 14 mm |
| water resistance | Waterproof | Waterproof |
| Always-On Display | No | No |
| has a touch screen | Yes | Yes |
| Gorilla Glass version | Gorilla Glass 3 | Gorilla Glass 3 |
| waterproof depth rating | 50 m | 50 m |
| Watch band is replaceable | Yes | Yes |
| Has sapphire glass display | No | No |
| maximum operating temperature | 40 °C | — |
| has branded damage-resistant glass | Yes | Yes |
| lowest potential operating temperature | 0 °C | — |
| Ingress Protection (IP) rating | — | IP68 |
| Battery | ||
| charge time | 2 hours | 1.5 hours |
| battery life | 9 days | 5 days |
| battery power | 230 mAh | 420 mAh |
| has wireless charging | No | No |
| has a removable battery | No | No |
| Has a solar power battery | No | No |
| has a rechargeable battery | Yes | Yes |
| Sensors | ||
| has GPS | Yes | Yes |
| has a compass | Yes | Yes |
| Has a barometer | No | No |
| has a gyroscope | Yes | No |
| Has a cadence sensor | No | No |
| has an accelerometer | Yes | Yes |
| Monitors perspiration | No | No |
| Has a heart rate monitor | Yes | Yes |
| Has a temperature sensor | No | No |
| Monitors blood oxygenation levels | Yes | No |
| Features | ||
| release date | 2021-04-06 | 2019-06-11 |
| Has a stopwatch | Yes | Yes |
| Has smart alarm | No | No |
| warranty period | 2 years | 1 years |
| Has call control | Yes | No |
| Has silent alarm | Yes | Yes |
| Has notifications | Yes | Yes |
| Has ECG technology | No | Yes |
| Locates your phone | Yes | No |
| has a front camera | No | No |
| has fall detection | No | No |
| has voice commands | Yes | Yes |
| Acquires GPS faster | No | No |
| Has vibrating alerts | Yes | Yes |
| number of microphones | 1 | 1 |
| Can be used to answer calls | No | No |
| has irregular heart rate warnings | No | Yes |
| has fast/slow heart rate notifications | Yes | — |
| Has a built-in camera remote control function | Yes | Yes |
| RAM | — | 0.5GB |
| CPU speed | — | 4 x 1.1 GHz |
| internal storage | — | 4GB |
| Connectivity | ||
| has NFC | No | No |
| supports ANT+ | No | No |
| supports Wi-Fi | No | Yes |
| supports Galileo | No | No |
| Bluetooth version | 5 | — |
| has a cellular module | No | No |
| Is compatible with iOS | Yes | Yes |
| Is compatible with Android | Yes | Yes |
| Miscellaneous | ||
| has aptX | No | No |
| Has passcode | Yes | Yes |
| maximum Bluetooth range | 10 m | — |
| Is compatible with Windows | No | No |
| Is compatible with Mac OS X | No | No |
| has an external memory slot | No | No |
| has a battery level indicator | Yes | Yes |
| has a socket for a 3.5 mm audio jack | No | No |
| Compatible with external heart rate monitors | Yes | Yes |
| Has auto pause | — | Yes |
| Compatible with smart scales | — | Yes |
| App & Software | ||
| Ad-free | Yes | Yes |
| Free app | Yes | Yes |
| Tracks BMI | Yes | Yes |
| Supports routes | Yes | Yes |
| Has achievements | Yes | Yes |
| Has goal setting | Yes | Yes |
| Has exercise diary | Yes | Yes |
| Can be personalised | Yes | Yes |
| Has weight tracking | Yes | No |
| Predicts start date | Yes | Yes |
| Tracks water intake | No | No |
| Has inactivity alerts | Yes | No |
| Has period notifications | Yes | Yes |
| Has temperature tracking | No | No |
| Provides activity reports | Yes | Yes |
| Counts how many calories you've burned | Yes | Yes |
| Has coaching | — | Yes |
| Includes maps | — | Yes |
| Has live tracking | — | Yes |
| Predicts ovulation | — | Yes |
| Displays fertile window notifications | — | Yes |
| Activity tracking | ||
| Measures pace | Yes | Yes |
| Tracks distance | Yes | Yes |
| Tracks elevation | No | Yes |
| Designed for golf | No | No |
| Tracks your sleep | Yes | Yes |
| Tracks steps taken | Yes | Yes |
| Designed for diving | No | No |
| Has a route tracker | Yes | No |
| Has exercise tagging | Yes | Yes |
| Has multi-sport mode | Yes | Yes |
| Tracks calorie intake | No | No |
| Provides sleep reports | Yes | Yes |
| Detects activities automatically | No | Yes |
| Has a stroke counter for swimming | Yes | No |
Wrist Fit
Amazfit Bip U Pro
Sits best on wrists ~43–58mm wide (≈ 11.5–15.5cm circumference).
Amazfit Smartwatch 2 ECG
Sits best on wrists ~37–51mm wide (≈ 9.9–13.6cm circumference).
2D Dimension Schematics
Accurate scale drawings based on case dimensions. Drag to pan, Ctrl+scroll to zoom. Works for every watch regardless of photo availability.
Frequently Asked Questions
Is the Amazfit Bip U Pro bigger than the Amazfit Smartwatch 2 ECG?
The Amazfit Bip U Pro is bigger — 35.5mm vs 35.4mm case width.
Which fits a smaller wrist better, the Amazfit Bip U Pro or the Amazfit Smartwatch 2 ECG?
The Amazfit Bip U Pro suits wrists around 43–58mm wide, and the Amazfit Smartwatch 2 ECG around 37–51mm. The one with the smaller lower bound is the safer pick for a small wrist.
Can I see the Amazfit Bip U Pro and Amazfit Smartwatch 2 ECG side by side at true scale?
Yes — the schematics and photos above show both watches at matched scale, and our fit tool overlays each on your wrist width.