| Microsoft Surface Duo |
Xiaomi Redmi Note 9 Pro |
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| Hardware and OS | Microsoft Surface Duo | Xiaomi Redmi Note 9 Pro |
| Operating system | Android 10 | Android 10.0; MIUI 11 |
| Processor | Octa-core (1x2.84 GHz Kryo 485 & 3x2.42 GHz Kryo 485 & 4x1.78 GHz Kryo 485) | Octa-core (2x2.3 GHz Kryo 465 Gold & 6x1.8 GHz Kryo 465 Silver) |
| Chipset | Qualcomm SM8150 Snapdragon 855 (7 nm) | Qualcomm SM7125 Snapdragon 720G (8 nm) |
| GPU | Adreno 640 | Adreno 618 |
| Internal memory | 128GB 6GB RAM, 256GB 6GB RAM | 64GB 4GB RAM, 128GB 6GB RAM |
| External memory | No | microSDXC (dedicated slot) |
| Display | Microsoft Surface Duo | Xiaomi Redmi Note 9 Pro |
| Type | AMOLED | IPS LCD |
| Size | 8.1 inches, 195.4 cm2 | 6.67" inc |
| Resolution | 1800 x 2700 pixels, 3:2 ratio | 1080 x 2400 px |
| Protection | Corning Gorilla Glass 5 | Corning Gorilla Glass 5 |
| Touchscreen | capacitive touchscreen | |
| Screen-to-Body Ratio | 84.5% | |
| Display area | 107.4 cm2 | |
| Display aspect ratio | 20:9 (height:width) | |
| Pixel Density | 395 PPI | |
| Colors | 16M | |
| Other | 450 nits typ. brightness (advertised) | |
| Main Camera | Microsoft Surface Duo | Xiaomi Redmi Note 9 Pro |
| Camera | 11 MP, f/2.0, 23mm (wide), 1.0µm, PDAF | |
| Features | HDR, panorama | |
| Video | 4K@30/60fps, 1080p@30/60/120/240fps, gyro-EIS, HDR | |
| Selfie camera | Microsoft Surface Duo | Xiaomi Redmi Note 9 Pro |
| Camera | Uses main camera | |
| Features | HDR, panorama | |
| Video | 4K@30/60fps, 1080p@30/60fps, gyro-EIS, HDR | |
| Connectivity | Microsoft Surface Duo | Xiaomi Redmi Note 9 Pro |
| 2G Network | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 850 / 900 / 1900 / 2100 | HSDPA 850 / 900 / 1900 / 2100 |
| 4G Network | 1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 19 20, 25, 26, 28, 29, 30, 38, 39, 40, 41, 46, 66 | LTE band 1(2100), 3(1800), 5(850), 8(900), 40(2300), 41(2500) |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot | |
| Network | GSM / HSPA / LTE | |
| SIM card | Dual SIM (Nano-SIM, dual stand-by) | |
| Bluetooth | 5.0, A2DP, LE, aptX Adaptive | 5.0, A2DP, LE |
| NFC | No | |
| Edge | Yes | |
| GPRS | Yes | |
| Technology | GSM / HSPA / LTE | |
| GPS | Yes, with A-GPS | Yes, with A-GPS, GLONASS, GALILEO, BDS, NavIC |
| Speed | HSPA 42.2/5.76 Mbps, LTE-A (CA) Cat18 1200/150 Mbps | HSPA 42.2/5.76 Mbps, LTE-A |
| WLAN | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot | |
| USB | USB Type-C 3.1 | 2.0, Type-C 1.0 reversible connector |
| Camera | Microsoft Surface Duo | Xiaomi Redmi Note 9 Pro |
| Main camera | 48 MP, Quad | |
| Specs | 48 MP, f/1.8, (wide), 1/2.25", 0.8µm, PDAF -8 MP, f/2.2, 13mm (ultrawide), 1/4.0", 1.12µm -5 MP, f/2.4, (macro), 1.12µm -2 MP, f/2.4, (depth) | |
| Features | LED flash, HDR, panorama | |
| Video | 2160p@30fps, 1080p@30/60/120fps, 720p@960fps, gyro-EIS | |
| Selfie camera | 16 MP, Single | |
| Multimedia | Microsoft Surface Duo | Xiaomi Redmi Note 9 Pro |
| Loudspeaker | Yes | |
| 3.5 mm Jack | No | Yes |
| Radio | No | FM radio, recording |
| Design | Microsoft Surface Duo | Xiaomi Redmi Note 9 Pro |
| Body | Stylus support | |
| SIM | Nano-SIM, eSIM | |
| Colors | White | Aurora Blue, Glacier White, Interstellar Black |
| Body build | Glass front (Gorilla Glass 5), glass back (Gorilla Glass 5) | Glass front (Gorilla Glass 5), glass back (Gorilla Glass 5), plastic frame |
| Dimensions | Unfolded: 186.9 x 145.2 x 4.8 mm Folded: 145.2 x 93.3 x 9.9 mm | 165.8 x 76.7 x 8.8 mm |
| Weight | 250 g (8.82 oz) | 209 g |
| Features | Microsoft Surface Duo | Xiaomi Redmi Note 9 Pro |
| Sensors | Fingerprint (side-mounted), dual accelerometer, dual gyro, proximity, dual compass | |
| Battery | Microsoft Surface Duo | Xiaomi Redmi Note 9 Pro |
| Type | Li-Po 3577 mAh, non-removable | |
| Charging | Fast charging 18W | |
| Battery capacity | 5020 mAh, Non-removable Li-Po | |
| Other | Microsoft Surface Duo | Xiaomi Redmi Note 9 Pro |
| Release date | 2020, March 12 | |
| Sensors | Fingerprint (side-mounted), accelerometer, gyro, proximity, compass , Infrared port |
