| Physical features | Samsung Galaxy Watch Active 2 (40mm SM-R835F) | Xiaomi Amazfit Stratos 2S |
| Model | Galaxy Watch Active 2 (40mm SM-R835F) | Amazfit Stratos 2S |
| Other model names | Galaxy Watch Active2 4G LTE SM-R835U (Stainless Steel) | Xiaomi Huami Amazfit 2 Stratos A1619, Amazfit Pace 2 |
| Country or region available | 
(Global, International) | 
(Europe) |
| Brand | Samsung | Xiaomi |
| Release date | September, 2019 | December, 2017 |
| Depth | 10.9 millimeters (0.43 inches) | 15 millimeters (0.59 inches) |
| Size (width x height) | 40 x 40 millimeters (1.57 x 1.57 in) | 25.4 x 51 millimeters (1 x 2.01 in) |
| Weight | 37 grams (1.3 ounces) | 68 grams (2.38 ounces) |
| Qwerty physical keyboard | Not supported | Not supported |
| Antenna | Internal antenna | Internal antenna |
| Build, materials | Stainless steel body, glass front | Plastic body with ceramic and stainless steel, glass front |
| Protection against water and others | 50 meters waterproof.
MIL-STD-810G military certified: salt, dust, humidity, rain, vibration, solar radiation, transport and thermal shock resistant. | 50 meters waterproof |
| System (OS) | Samsung Galaxy Watch Active 2 (40mm SM-R835F) | Xiaomi Amazfit Stratos 2S |
| Operating system | Tizen 4.0 | Proprietary OS |
| Firmware update | feature not registered | feature not registered |
| Hardware | Samsung Galaxy Watch Active 2 (40mm SM-R835F) | Xiaomi Amazfit Stratos 2S |
| Chipset | 64bit - Samsung Exynos 9 Dual 9110 (10nm) | 32bit - Ingenic M200S |
| CPU processor | 1.15Ghz Dual-Core ARM Cortex-A53 | Dual-Core, 2 processors:
1.2Ghz Single-Core XBurst-HP
300Mhz Single-Core XBurst-LP |
| GPU graphical controller | ARM Mali-T720 MP1 | 3D GPU |
| RAM memory | 1.5GB LPDDR3 | 512MB LPDDR2 |
| Internal storage | 4GB (1.39GB available)
eMMC | 4GB (2GB available)
eMCP |
| External storage | Not supported | Not supported |
| Display | Samsung Galaxy Watch Active 2 (40mm SM-R835F) | Xiaomi Amazfit Stratos 2S |
| Display type | Super AMOLED | TFT LCD |
| Screen size | 1.2" inches | 1.34" inches |
| Screen-to-body ratio | ~29% (screen-to-body ratio) | ~44.6% (screen-to-body ratio) |
| Display resolution | 360x360 pixels (1:1) | 320x300 pixels |
| Touchscreen | Capacitive Multitouch | Capacitive Multitouch |
| Pixel density (dot pitch) | 424 PPI | 327 PPI |
| Colors | 16 million | 260 thousand |
| Scratch-resistant glass | Gorilla Glass DX+ | Sapphire Glass |
| Display features | Not supported | feature not registered |
| Mobile networks | Samsung Galaxy Watch Active 2 (40mm SM-R835F) | Xiaomi Amazfit Stratos 2S |
| Dual-SIM | Not supported | Not supported |
| SIM card | 1 slot (Single-SIM)
e-SIM (Eletronic) | Not supported |
| Maximum download/upload | 150/50 Mbps | feature not registered |
| Network technology | 2G, 3G, 4G | feature not registered |
| Frequency, bands | Expand band detailsCollapse details |
| GSM Mhz band | Quad-Band 850/900/1800/1900 | Not supported |
| Primary 2G network | GSM 850/900/1800/1900 | Not supported |
| Primary 3G network | UMTS 850/900/2100 | Not supported |
| Primary 4G network | LTE Cat4 (1, 3, 5, 7, 8, 20) | Not supported |
| Primary 5G network | Not supported | Not supported |
| Primary data network | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, LTE | Not supported |
| Secondary 2G network | Not supported | Not supported |
| Secondary 3G network | Not supported | Not supported |
| Secondary 4G network | Not supported | Not supported |
| Secondary data network | Not supported | Not supported |
| Calling | Samsung Galaxy Watch Active 2 (40mm SM-R835F) | Xiaomi Amazfit Stratos 2S |
| Messaging | SMS (T9), MMS, E-mail, Push mail | SMS (T9), E-mail |
| Speakerphone | Supported | Supported |
| Video calling | Not supported | Not supported |
| Call control | Voice dialing, Voice recorder, Voice commands | Not supported |
| Camera | Samsung Galaxy Watch Active 2 (40mm SM-R835F) | Xiaomi Amazfit Stratos 2S |
| Back camera (main camera) | Not supported | Not supported |
| Main camera resolution | Not supported | Not supported |
| Video recording (primary) | Not supported | Not supported |
| Flash | Not supported | Not supported |
| Focal aperture | feature not registered | feature not registered |
| Focal length | feature not registered | feature not registered |
| Sensor size | feature not registered | feature not registered |
| Pixel size | feature not registered | feature not registered |
| Autofocus | Not supported | Not supported |
| Touch focus | Not supported | Not supported |
| Image stabilization | Not supported | Not supported |
| Zoom | Not supported | Not supported |
| Face/smile detection | Not supported | Not supported |
| BSI sensor | Not supported | Not supported |
| HDR | Not supported | Not supported |
| 2ª camera | Samsung Galaxy Watch Active 2 (40mm SM-R835F) | Xiaomi Amazfit Stratos 2S |
| Front camera (secondary) | Not supported | Not supported |
| Front camera resolution | Not supported | Not supported |
| Video recording (secondary) | Not supported | Not supported |
| Front flash | Not supported | Not supported |
| Focal aperture | feature not registered | feature not registered |
| Focal length | feature not registered | feature not registered |
| Sensor size | feature not registered | feature not registered |
| Pixel size | feature not registered | feature not registered |
| Multimedia | Samsung Galaxy Watch Active 2 (40mm SM-R835F) | Xiaomi Amazfit Stratos 2S |
| Radio | Not supported | Not supported |
| TV | Not supported | Not supported |
| Video formats | MP4 | feature not registered |
| Audio formats | MP3, WAV, WMA, OGG, eAAC+ | MP3, eAAC+ |
| Connectivity | Samsung Galaxy Watch Active 2 (40mm SM-R835F) | Xiaomi Amazfit Stratos 2S |
| USB | Not supported | MicroUSB 2.0 |
| TV output | Not supported | Not supported |
| Audio output | Not supported | Not supported |
| Bluetooth | 5.0 + A2DP/LE | 4.0 + A2DP |
| WiFi | 802.11 b/g/n (2.4Ghz) | 802.11 b/g (2.4Ghz) |
| DLNA | Not supported | Not supported |
| NFC | Supported | Not supported |
| GPS | A-GPS, GeoTagging, GLONASS, GALILEO, BeiDou | A-GPS, GeoTagging, GLONASS |
| Infrared port | Not supported | Not supported |
| Other functions | Samsung Galaxy Watch Active 2 (40mm SM-R835F) | Xiaomi Amazfit Stratos 2S |
| Active noise cancellation | Not supported | Not supported |
| Vibrating alert | Supported | Supported |
| Ringtones | Polyphonic and customized | feature not registered |
| Web browser | Not supported | Not supported |
| Sensors | Accelerometer
Ambient Light sensor
Barometer
Heart rate
Pedometer
| Accelerometer
Compass
Ambient Light sensor
Gyroscope
Barometer
Heart rate
Pedometer
|
| Other features | - Colors: Black, Silver, Pink Gold
- Bands: 20mm
- Always-on display
- Samsung Pay | - Colors: Black
- Leather watch band
- 22mm standard watch band
- 2.5D glass display
- Dock charger included
- Always-on display
- Languages: Chinese, English, Spanish
- Mi Fit app compatible
- Compatible with Android 4.4, iOS 9 and above |
| Power supply | Samsung Galaxy Watch Active 2 (40mm SM-R835F) | Xiaomi Amazfit Stratos 2S |
| Battery | Li-Ion: Lithium-Ion (Non removable) | LiPo: Li-Ion polymer (Non removable) |
| Battery capacity | 247 mAh | 290 mAh |
| Charger, watts | Standard charging
Qi wireless charging | Standard charging |
| Talk time autonomy | 2580 minutes | 43 hours | 1.8 days | 1800 minutes | 30 hours | 1.3 days |
| Standby | feature not registered | 7200 minutes | 120 hours | 5 days |
| Radiation rate | Samsung Galaxy Watch Active 2 (40mm SM-R835F) | Xiaomi Amazfit Stratos 2S |
| SAR 1.6W/kg (USA, Mexico, etc.) | feature not registered | feature not registered |
| SAR 2W/kg (Europe, UK, etc.) | 0.255W/kg (head) | 1.528W/kg (body) | feature not registered |