In depth comparison and review of Xiaomi Redmi Note 9S and Microsoft Surface Duo. Compare sizes, cameras, batteries, memory, and other important specifications and features to easily choose the right phone for you. Our goal is to help you uncover differences between the products and find the phone that will best fit your needs.
| DESIGN AND DIMENSIONS | Xiaomi Redmi Note 9S | Microsoft Surface Duo |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Form Factor | Touch | Folder - dual screen | |
| Height | 165.75 mm | 145.2 mm | Xiaomi Redmi Note 9S has greater height than Microsoft Surface Duo. |
| Width | 76.68 mm | 93.3 mm | Microsoft Surface Duo has greater width than Xiaomi Redmi Note 9S. |
| Depth | 8.8 mm | 9.9 mm | Xiaomi Redmi Note 9S is narrower than Xiaomi Redmi Note 9S. |
| Weight | 209 g | 250 g | Xiaomi Redmi Note 9S is lighter than Xiaomi Redmi Note 9S. |
| Dimensions Details | - | Unfolded - 186.9 mm x 4.8 mm x 145.2 mm | |
| Body Colour | Aurora blue | Glacier | |
| Body Material | Curved 3D glass, Gorilla glass 5 | - | |
| Protection | Dustproof, splashproof | - | |
| Waterproof (Water-resistant) | - | - | |
| SAR Value | 0.98 W/kg (body), 0.72 W/kg (head), 2.35 W/kg (limb) | 0.726 W/kg (head), 1.478 W/kg (body) | |
| Integrated Components | Ultra-linear speakers | - | |
| Connector Type | USB Type-C - 24 pin USB-C Headset jack - mini-phone 3.5mm |
USB Type-C - 24 pin USB-C | |
| SIM Card Type (Size) | Nano SIM | Nano SIM, Electronic SIM card (e-SIM) | |
| SIM Card Qty | Dual-SIM | Dual-SIM | |
| SIM Card Configuration Details | Nano SIM + nano SIM/microSD | - |
| DISPLAY | Xiaomi Redmi Note 9S | Microsoft Surface Duo |
|---|
| Display Type | LCD display | OLED display | |
|---|---|---|---|
| Display Technology | - | AMOLED | |
| Foldable Display | - | Yes | |
| Display Design | - | Both directions folding | |
| Screen Size (Display Size) | 6.67" | 5.6" | Xiaomi Redmi Note 9S has larger screen size than Microsoft Surface Duo. |
| Screen Resolution (Display Resolution) | 2400 x 1080 pixels | 1800 x 1350 pixels | Xiaomi Redmi Note 9S has better screen resolution than Microsoft Surface Duo. |
| Display Format | Full HD+ | - | |
| Pixel Density | - | 401 ppi | |
| Aspect Ratio | - | 4:3 | |
| Contrast Ratio | 1500:1 | - | |
| HDR | Yes | - | Xiaomi Redmi Note 9S has HDR. |
| Display Features | Reading mode 2.0, Dot Display | PixelSense Fusion Displays | |
| Display Protection (Screen Protector) | Corning Gorilla Glass 5 (scratch resistant glass) | Corning Gorilla Glass (scratch resistant glass) |
| SECOND DISPLAY |
|---|
| Second Display Type | - | OLED display - colour | |
|---|---|---|---|
| Second Display Screen Size | - | 5.6" | |
| Second Display Resolution | - | 1800 x 1350 pixels |
| UNFOLDED DISPLAY |
|---|
| Unfolded Display Screen Size | - | 8.1 in | |
|---|---|---|---|
| Unfolded Display Resolution | - | 2700 x 1800 pixels |
| PROCESSOR | Xiaomi Redmi Note 9S | Microsoft Surface Duo |
|---|
| Processor Type (CPU) | Qualcomm Snapdragon 720G | Qualcomm Snapdragon 855 | |
|---|---|---|---|
| Clock Speed | 2.3 GHz | - | |
| Processor Core Qty | 8-core | 8-core | Both phones have the same number of phone cores. |
| 64-bit Architecture | Yes | - | Xiaomi Redmi Note 9S has 64-bit architecture. |
| Graphics System (GPU) | Qualcomm ADRENO 618 | - |
| MEMORY | Xiaomi Redmi Note 9S | Microsoft Surface Duo |
|---|
| RAM | 4 GB | 6 GB | Microsoft Surface Duo has more RAM than Xiaomi Redmi Note 9S. |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 64 GB | 128 GB | Microsoft Surface Duo has more internal memory than Xiaomi Redmi Note 9S. |
| Memory Interface | - | UFS 3.0 | |
| Supported Flash Memory Cards (Expandable Memory) | microSDHC, microSDXC - up to 512 GB | - |
| CAMERA | Xiaomi Redmi Note 9S | Microsoft Surface Duo |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 4 | 0 | |
|---|---|---|---|
| Sensor Resolution | 48 Megapixel | - | |
| Sensor Size | 1/2" | - | |
| Lens Aperture | F/1.79 | - | |
| Lens Construction | 6-element | - | |
| Field of View (FoV) | 79 degree(s) | - | |
| Pixel Size | 0.8 μm | - | |
| Focus Adjustment | Automatic | - | |
| Special Effects | HDR, Kaleidoscope | - | |
| Camera Modes | Burst mode, Panorama, night mode, Smart ultra-wide angle mode, Photo timer, Custom watermark, Documents, Beautify, Levelling, Cinematic portraits | - | |
| Face Recognition (Face ID) | Face recognition | - | Xiaomi Redmi Note 9S has face detection. |
| Light Source | Dual LED flash | - | |
| Still Image Resolutions | 8000 x 6000 | - | |
| Video Resolutions | 1920 x 1080 (1080p) at 30 fps, 1920 x 1080 (1080p) at 60 fps, 1280 x 720 (720p) at 30 fps, Slo-mo video 1920 x 1080 (1080p) at 120 fps, Slo-mo video 1280 x 720 (720p) at 240 fps, 3840 x 2160 (4K) at 30 fps, Slo-mo video 1280 x 720 (720p) at 120 fps, Slo-mo video 1280 x 720 (720p) at 960 fps | - | |
| Camera Features (Functions) | 4-in-1 Super Pixel, AI scene detection, Portrait mode with background blurring, Ultra wide-angle edge distortion correction, Steady handheld night photography, full screen frame, AI watermark | - |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | 8 Megapixel | - | |
|---|---|---|---|
| Lens Type (2nd Camera) | Ultra wide-angle lens | - | |
| Lens Aperture (2nd Camera) | F/2.2 | - | |
| Field of View (2nd Camera) | 119 degree(s) | - | |
| Pixel Size (2nd Camera) | 1.12 μm | - |
| THIRD CAMERA |
|---|
| Sensor Resolution (3rd Camera) | 5 Megapixel | - | |
|---|---|---|---|
| Lens Aperture (3rd Camera) | F/2.4 | - | |
| Pixel Size (3rd Camera) | 1.12 μm | - | |
| Camera Functions (3rd Camera) | Macro camera | - | |
| Camera Features (3rd Camera) | AF (2cm-10cm) | - |
| FOURTH CAMERA |
|---|
| Sensor Resolution (4th Camera) | 2 Megapixel | - | |
|---|---|---|---|
| Lens Aperture (4th Camera) | F/2.4 | - | |
| Pixel Size (4th Camera) | 1.75 μm | - | |
| Camera Functions (4th Camera) | Depth camera | - |
| FRONT CAMERA |
|---|
| Number of Front Cameras | 1 | 1 | |
|---|---|---|---|
| Sensor Resolution (Front) | 16 Megapixel | 11 Megapixel | Xiaomi Redmi Note 9S has better front camera resolution than Microsoft Surface Duo. |
| Lens Aperture (Front) | F/2.48 | F/2.0 | Microsoft Surface Duo has better front lens aperture than Xiaomi Redmi Note 9S. |
| Field of View (Front) | - | 84 degree(s) | |
| Pixel Size (Front) | 1 μm | 1 μm | Both phones have the same front camera pixel size. |
| Special Effects (Front) | HDR | HDR | |
| Camera Modes (Front) | Panoramic selfies, AI portrait mode, AI Beautify, Slo-mo Selfie | Burst mode, Panorama, low-light shots, Portrait mode with adjustable depth control | |
| Face Recognition (Face ID) | Face recognition | - | Xiaomi Redmi Note 9S has face detection. |
| Light Source (Front) | Display flash | High CRI LED flash | |
| Video Resolutions (Front) | - | 1920 x 1080 (1080p) at 30 fps, 1920 x 1080 (1080p) at 60 fps, 3840 x 2160 (4K) at 30 fps, 3840 x 2160 (4K) at 60 fps | |
| Camera Features (Front) | AI scene detection, Palm shutter, AI silhouette detection | Phase Detect Auto-Focus (PDAF), FOV optimised with AI (for front and rear), dynamic range scene detection, Super-resolution zoom, super zoom up to 7x, gyro-based digital video stabilisation |
| BATTERY AND CHARGING | Xiaomi Redmi Note 9S | Microsoft Surface Duo |
|---|
| Battery Capacity (Battery Size) | 5020 mAh | 3577 mAh | Xiaomi Redmi Note 9S has larger battery capacity than Microsoft Surface Duo. |
|---|---|---|---|
| Standby Time | - | 240 hours | |
| Talk Time | 1980 minutes | 1620 minutes | Xiaomi Redmi Note 9S has longer battery life when making calls than Microsoft Surface Duo. |
| Run Time Details | Talk: up to 1980 min Gaming: up to 13 hrs Playback (Music): up to 147 hrs Navigation: up to 16 hrs |
Standby: up to 240 hrs Talk: up to 1620 min Playback (local video): up to 15.5 hrs |
|
| Battery Technology | Lithium Ion | - |
| CELLULAR | Xiaomi Redmi Note 9S | Microsoft Surface Duo |
|---|
| Technology | WCDMA (UMTS) / GSM | WCDMA (UMTS) / GSM | |
|---|---|---|---|
| Mobile Broadband Generation | 4G | 4G | Both phones have the same mobile network generation. |
| Operating System | - | Android 10 | |
| User Interface | MIUI 10 | - | |
| Intelligent Assistant | - | Google Assistant | |
| Payment Technology | Google Pay | - | |
| Navigation | GPS, A-GPS, GLONASS, BeiDou, Galileo | GPS, GLONASS, BeiDou, Galileo, QZSS |
| COMMUNICATIONS | Xiaomi Redmi Note 9S | Microsoft Surface Duo |
|---|
| Data Transmission | GPRS, EDGE, HSDPA, HSUPA, HSPA+, VoLTE, FDD-LTE, TDD-LTE | GPRS, FDD-LTE, TDD-LTE, LAA | |
|---|---|---|---|
| 2G Band | 850 GSM, 900 GSM, 1900 GSM, 2100 GSM | 850 GSM, 900 GSM, 1800 GSM, 1900 GSM | |
| 3G UMTS Band | Band 1, Band 2, Band 4, Band 5, Band 8 | Band 1, Band 2, Band 5, Band 8 | |
| 3G UMTS Frequency | 2100, 1900, 1700, 850, 900 | 2100, 1900, 850, 900 | |
| 4G LTE Band | Band 1, Band 2, Band 3, Band 4, Band 5, Band 7, Band 8, Band 20, Band 28, Band 38, Band 40 | Band 1, Band 2, Band 3, Band 4, Band 5, Band 7, Band 8, Band 12, Band 13, Band 14, Band 19, Band 20, Band 25, Band 26, Band 28, Band 29, Band 30, Band 38, Band 39, Band 40, Band 41, Band 46, Band 66 | |
| 4G LTE Frequency | FDD 2100, FDD 1900 PCS, FDD 1800+, FDD 1700 - 2110 AWS, FDD 850, FDD 2600, FDD 900, FDD 800 DD, FDD 700 APT, TDD 2600, TDD 2300 | FDD 2100, FDD 1900 PCS, FDD 1800+, FDD 1700 - 2110 AWS, FDD 850, FDD 2600, FDD 900, FDD 700a, FDD 700c, FDD 700 PS, FDD 800 upper, FDD 800 DD, FDD 1900+, FDD 850+, FDD 700 APT, FDD 700d, FDD 2300 WCS, TDD 2600, TDD 1900, TDD 2300, TDD 2500, TDD 5150, FDD 1700 - 2110 AWS-3 | |
| Wireless Interface | IEEE 802.11a/b/g/n/ac | IEEE 802.11ac | |
| Bluetooth | Bluetooth 5.0 | Bluetooth 5.0 | |
| Messaging Services | SMS, MMS | - |
| MEDIA | Xiaomi Redmi Note 9S | Microsoft Surface Duo |
|---|
| Supported Digital Audio Standards | WAV, AAC, AMR, MP3, FLAC, APE (Monkey's Audio), MP4 | WAV, AAC, AMR, MP3, FLAC, OGG, MIDI, M4A, apt-X, IMY, RTTTL, RTX, OTA, MID | |
|---|---|---|---|
| Supported Digital Video Standards | MKV, XviD, M4V, MP4 | MKV, FLV, AVI, MOV, WMV, 3GP, TS, WebM, H.265 HEVC, MP4 | |
| Sound Enhancements | - | Qualcomm aptX audio | |
| Audio Amplifier | Smart PA | - |
| FEATURES | Xiaomi Redmi Note 9S | Microsoft Surface Duo |
|---|
| Phone Functions | Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert | Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert | |
|---|---|---|---|
| Sensors | Accelerometer, digital compass, gyro sensor, distance sensor, infrared (IR) sensor, In-screen ambient light sensor | Proximity sensor, hall sensor, dual accelerometers, dual gyroscope, dual magnetometer, dual ambient light sensor | |
| Security Devices | Face recognition, fingerprint reader (side) | Fingerprint reader (side) | |
| Security Technology | A.I. face recognition | - | |
| Additional Phone Features | Infrared remote control, AI face unlock, Qualcomm 5th generation AI Engine, Z-axis linear vibration motor | MIMO technology, Fast Charging, dual microphones with noise suppression and echo cancellation, Full Duplex communication, 360° hinge, stylus support, two apps side-by-side |
| OTHERS | Xiaomi Redmi Note 9S | Microsoft Surface Duo |
|---|
| Included Accessories | Protective cover, SIM card removal tool, USB-C cable, 18W charger | SIM card removal tool, USB-C headphones, 18W charger, Surface Duo Bumper (Glacier) | |
|---|---|---|---|
| Compliant Standards | TUV Rheinland | - |
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