| Oppo K21 |
Xiaomi Redmi Note 9 Pro |
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| Hardware and OS | Oppo K21 | Xiaomi Redmi Note 9 Pro |
| Operating system | Android v11 | Android 10.0; MIUI 11 |
| Processor | Qualcomm SDM765 Snapdragon 765G (7 nm) | Octa-core (2x2.3 GHz Kryo 465 Gold & 6x1.8 GHz Kryo 465 Silver) |
| Chipset | Qualcomm SM7125 Snapdragon 720G (8 nm) | |
| RAM | 8 GB | |
| GPU | Adreno 618 | |
| Internal Storage | 128 GB | |
| Internal memory | 64GB 4GB RAM, 128GB 6GB RAM | |
| External memory | microSDXC (dedicated slot) | |
| Display | Oppo K21 | Xiaomi Redmi Note 9 Pro |
| Type | AMOLED | IPS LCD |
| Size | 6.4 inches | 6.67" inc |
| Resolution | 1080 x 2400 Pixels | 1080 x 2400 px |
| Protection | Corning Gorilla Glass 5 | |
| Touchscreen | Yes, Capacitive Touchscreen, Multi-touch | capacitive touchscreen |
| Screen-to-Body Ratio | 84.5% | |
| Display area | 107.4 cm2 | |
| Display aspect ratio | 20:9 (height:width) | |
| Pixel Density | 411 ppi | 395 PPI |
| Colors | 16M | |
| Other | 450 nits typ. brightness (advertised) | |
| Connectivity | Oppo K21 | Xiaomi Redmi Note 9 Pro |
| Network support | 5G , 4G , 3G, 2G | |
| NFC | Yes | |
| Dual SIM | Dual SIM, GSM GSM | |
| SIM size | SIM1: Nano, SIM2: Nano | |
| USB connectivity | Mass storage device, USB charging | |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | |
| 3G Network | HSDPA 850 / 900 / 1900 / 2100 | |
| 4G Network | LTE band 1(2100), 3(1800), 5(850), 8(900), 40(2300), 41(2500) | |
| Wi-Fi | Yes, Wi-Fi 802.11, b/g/n | 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 | Yes, v5.1 | 5.0, A2DP, LE |
| Edge | Yes | |
| GPRS | Yes | |
| GPS | Yes, with A-GPS, Glonass | Yes, with A-GPS, GLONASS, GALILEO, BDS, NavIC |
| Speed | HSPA 42.2/5.76 Mbps, LTE-A | |
| USB | 2.0, Type-C 1.0 reversible connector | |
| Camera | Oppo K21 | Xiaomi Redmi Note 9 Pro |
| Front camera | 32 MP | |
| Front camera resolution | 32 MP, f/2.0, 26mm (wide), 1/2.8", 0.8µm | |
| Camera features | Digital Zoom, Auto Flash, Face detection, Touch to focus | |
| Flash | Yes, LED Flash | |
| Autofocus | Yes | |
| Video recording | Yes | |
| Main camera | 48 MP 8 MP 2 MP 2 MP | 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 | Oppo K21 | Xiaomi Redmi Note 9 Pro |
| Loudspeaker | Yes | |
| 3.5 mm Jack | Yes | |
| Radio | FM radio, recording | |
| Design | Oppo K21 | Xiaomi Redmi Note 9 Pro |
| Height | 160.3 mm | |
| Width | 74.3 mm | |
| Thickness | 8 mm | |
| Colours | Moonlight Black, Pearl White, Blue, Blue, Red | |
| Colors | Aurora Blue, Glacier White, Interstellar Black | |
| Body build | Glass front (Gorilla Glass 5), glass back (Gorilla Glass 5), plastic frame | |
| Dimensions | 165.8 x 76.7 x 8.8 mm | |
| Weight | 180 grams | 209 g |
| Battery | Oppo K21 | Xiaomi Redmi Note 9 Pro |
| Capacity | 4500 mAh | |
| Type | Li-Polymer | |
| Battery capacity | 5020 mAh, Non-removable Li-Po | |
| Other | Oppo K21 | Xiaomi Redmi Note 9 Pro |
| Fingerprint sensor | Yes | |
| Fingerprint sensor position | On-Screen | |
| Other sensors | Accelerometer, Gyro, Proximity, Compass | |
| Release date | 2020, March 12 | |
| Sensors | Fingerprint (side-mounted), accelerometer, gyro, proximity, compass , Infrared port |
