| Physical features | Xiaomi Amazfit Stratos 2S | Xiaomi Redmi Note 4 (MTK 32GB) |
| Model | Amazfit Stratos 2S | Redmi Note 4 (MTK 32GB) |
| Other model names | Xiaomi Huami Amazfit 2 Stratos A1619, Amazfit Pace 2 | 红米Note 4, Redmi Note 4 (MediaTek) Deca-Core, Xiaomi Nikel |
| Country or region available | 
(Europe) |  
China, Hong Kong |
| Brand | Xiaomi | Xiaomi |
| Release date | December, 2017 | August, 2016 |
| Depth | 15 millimeters (0.59 inches) | 8.35 millimeters (0.33 inches) |
| Size (width x height) | 25.4 x 51 millimeters (1 x 2.01 in) | 76 x 151 millimeters (2.99 x 5.94 in) |
| Weight | 68 grams (2.38 ounces) | 175 grams (6.13 ounces) |
| Qwerty physical keyboard | Not supported | Not supported |
| Antenna | Internal antenna | Internal antenna |
| Build, materials | Plastic body with ceramic and stainless steel, glass front | Aluminum body, glass front |
| Protection against water and others | 50 meters waterproof | Not supported |
| System (OS) | Xiaomi Amazfit Stratos 2S | Xiaomi Redmi Note 4 (MTK 32GB) |
| Operating system | Proprietary OS | Android 6.0.1 Marshmallow |
| Firmware update | feature not registered | Android 7.0 Nougat |
| Hardware | Xiaomi Amazfit Stratos 2S | Xiaomi Redmi Note 4 (MTK 32GB) |
| Chipset | 32bit - Ingenic M200S | 64bit - MediaTek MT6797 Helio X20 (20nm) |
| CPU processor | Dual-Core, 2 processors:
1.2Ghz Single-Core XBurst-HP
300Mhz Single-Core XBurst-LP | Deca-Core, 3 processors:
2.1Ghz Dual-Core ARM Cortex-A72
1.85Ghz Quad-Core ARM Cortex-A53
1.4Ghz Quad-Core ARM Cortex-A53 |
| GPU graphical controller | 3D GPU | ARM Mali-T880 MP4 780Mhz |
| RAM memory | 512MB LPDDR2 | 3GB LPDDR3 |
| Internal storage | 4GB (2GB available)
eMCP | 32GB (22GB available) |
| External storage | Not supported | Until 256GB microSD, microSDXC
(hybrid slot/shares the same SIM-2 slot) |
| Display | Xiaomi Amazfit Stratos 2S | Xiaomi Redmi Note 4 (MTK 32GB) |
| Display type | TFT LCD | TFT IPS LCD |
| Screen size | 1.34" inches | 5.5" inches |
| Screen-to-body ratio | ~44.6% (screen-to-body ratio) | ~72.7% (screen-to-body ratio) |
| Display resolution | 320x300 pixels | 1080x1920 pixels |
| Touchscreen | Capacitive Multitouch | Capacitive Multitouch |
| Pixel density (dot pitch) | 327 PPI | 401 PPI |
| Colors | 260 thousand | 16 million |
| Scratch-resistant glass | Sapphire Glass | Not supported |
| Display features | feature not registered | feature not registered |
| Mobile networks | Xiaomi Amazfit Stratos 2S | Xiaomi Redmi Note 4 (MTK 32GB) |
| Dual-SIM | Not supported | Dual-SIM Standby - Call active on one sim card
(hybrid slot/shares the same microSD slot) |
| SIM card | Not supported | 2 slots (Dual-SIM)
micro-SIM (3FF) and nano-SIM (4FF) |
| Maximum download/upload | feature not registered | 150/50 Mbps |
| Network technology | feature not registered | 2G, 3G, 4G |
| Frequency, bands | Expand band detailsCollapse details |
| GSM Mhz band | Not supported | Quad-Band 850/900/1800/1900 |
| Primary 2G network | Not supported | CDMA 800/1900, GSM 850/900/1800/1900 |
| Primary 3G network | Not supported | CDMA2000 1xEV-DO
TD-SCDMA 1900/2000
UMTS 850/900/1900/2100 |
| Primary 4G network | Not supported | LTE Cat4 850/900/1800/2100/2600 (Bands 1,3,5,7,8)
TD-LTE 1900/2300/2500/2600 (Bands 38,39,40,41) |
| Primary 5G network | Not supported | Not supported |
| Primary data network | Not supported | GPRS, EDGE, CDMA2000 EV-DO Rev 0, CDMA2000 EV-DO Rev A, TD-SCDMA, UMTS, TD-HSDPA, HSDPA, HSUPA, HSPA+, TD-LTE, LTE |
| Secondary 2G network | Not supported | GSM 850/900/1800/1900 |
| Secondary 3G network | Not supported | UMTS 850/900/1900/2100 |
| Secondary 4G network | Not supported | Not supported |
| Secondary data network | Not supported | GPRS, EDGE |
| Calling | Xiaomi Amazfit Stratos 2S | Xiaomi Redmi Note 4 (MTK 32GB) |
| Messaging | SMS (T9), E-mail | SMS (T9), MMS, E-mail, Push mail |
| Speakerphone | Supported | Supported |
| Video calling | Not supported | Supported |
| Call control | Not supported | Voice dialing, Voice recorder, Voice commands |
| Camera | Xiaomi Amazfit Stratos 2S | Xiaomi Redmi Note 4 (MTK 32GB) |
| Back camera (main camera) | Not supported | 13 megapixels |
| Main camera resolution | Not supported | 4128x3096 pixels |
| Video recording (primary) | Not supported | Full HD (1920x1080) 30 fps |
| Flash | Not supported | Dual-LED flash |
| Focal aperture | feature not registered | f/2.0 (aperture) |
| Focal length | feature not registered | feature not registered |
| Sensor size | feature not registered | feature not registered |
| Pixel size | feature not registered | 1.12µm pixel |
| Autofocus | Not supported | PDAF: phase detection autofocus |
| Touch focus | Not supported | Supported |
| Image stabilization | Not supported | EIS: Digital stabilization |
| Zoom | Not supported | Only digital zoom |
| Face/smile detection | Not supported | Face detection, Smile detection |
| BSI sensor | Not supported | Supported |
| HDR | Not supported | HDR photo on both cameras |
| 2ª camera | Xiaomi Amazfit Stratos 2S | Xiaomi Redmi Note 4 (MTK 32GB) |
| Front camera (secondary) | Not supported | 5 megapixels |
| Front camera resolution | Not supported | 2592x1944 pixels |
| Video recording (secondary) | Not supported | HD (1280x720) |
| Front flash | Not supported | Not supported |
| Focal aperture | feature not registered | f/2.0 (aperture) |
| 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 | Xiaomi Amazfit Stratos 2S | Xiaomi Redmi Note 4 (MTK 32GB) |
| Radio | Not supported | FM |
| TV | Not supported | Not supported |
| Video formats | feature not registered | MP4, H.265, H.264, H.263, XviD |
| Audio formats | MP3, eAAC+ | MP3, OGG, eAAC+, FLAC |
| Connectivity | Xiaomi Amazfit Stratos 2S | Xiaomi Redmi Note 4 (MTK 32GB) |
| USB | MicroUSB 2.0 | MicroUSB 2.0 |
| TV output | Not supported | Not supported |
| Audio output | Not supported | 3.5mm jack |
| Bluetooth | 4.0 + A2DP | 4.2 + A2DP |
| WiFi | 802.11 b/g (2.4Ghz) | 802.11 a/b/g/n/ac (2.4Ghz, 5Ghz) + MIMO |
| DLNA | Not supported | Not supported |
| NFC | Not supported | Not supported |
| GPS | A-GPS, GeoTagging, GLONASS | A-GPS, GeoTagging, GLONASS, BeiDou |
| Infrared port | Not supported | Supported |
| Other functions | Xiaomi Amazfit Stratos 2S | Xiaomi Redmi Note 4 (MTK 32GB) |
| Active noise cancellation | Not supported | Supported |
| Vibrating alert | Supported | Supported |
| Ringtones | feature not registered | Polyphonic and customized |
| Web browser | Not supported | HTML, XHTML, HTML5 |
| Sensors | Accelerometer
Compass
Ambient Light sensor
Gyroscope
Barometer
Heart rate
Pedometer
| Accelerometer
Proximity sensor
Compass
Ambient Light sensor
Gyroscope
Fingerprint sensor
Hall effect
|
| Other features | - 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 | - Colors: Black, Silver, Gray, Gold, Blue
- USB OTG On-The-Go
- Aluminum body
- 2.5D curved glass
- MIUI 8.0
- 720p@120fps slow-motion
- 24-bit/192kHz audio
- WiFi display
- WiFi direct, hotspot |
| Power supply | Xiaomi Amazfit Stratos 2S | Xiaomi Redmi Note 4 (MTK 32GB) |
| Battery | LiPo: Li-Ion polymer (Non removable) | LiPo: Li-Ion polymer (Non removable) |
| Battery capacity | 290 mAh | 4100 mAh |
| Charger, watts | Standard charging | Standard charging |
| Talk time autonomy | 1800 minutes | 30 hours | 1.3 days | feature not registered |
| Standby | 7200 minutes | 120 hours | 5 days | feature not registered |
| Radiation rate | Xiaomi Amazfit Stratos 2S | Xiaomi Redmi Note 4 (MTK 32GB) |
| SAR 1.6W/kg (USA, Mexico, etc.) | feature not registered | feature not registered |
| SAR 2W/kg (Europe, UK, etc.) | feature not registered | feature not registered |