| OPPO A4 |
Xiaomi Redmi Note 9 Pro |
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| Hardware and OS | OPPO A4 | Xiaomi Redmi Note 9 Pro |
| Operating system | Android v11 | Android 10.0; MIUI 11 |
| Processor | Octa core (2 GHz, Quad core, Cortex A73 2 GHz, Quad core, Cortex A53) | Octa-core (2x2.3 GHz Kryo 465 Gold & 6x1.8 GHz Kryo 465 Silver) |
| Chipset | MediaTek Helio P60 | Qualcomm SM7125 Snapdragon 720G (8 nm) |
| GPU | Mali-G72 MP3 | Adreno 618 |
| Architecture | 64 bit | |
| Internal memory | 128 GB | 64GB 4GB RAM, 128GB 6GB RAM |
| External memory | Yes, Up to 256 GB | microSDXC (dedicated slot) |
| RAM | 4 GB | |
| Display | OPPO A4 | Xiaomi Redmi Note 9 Pro |
| Type | IPS LCD | IPS LCD |
| Size | 6.2 inches (15.75 cm) | 6.67" inc |
| Resolution | 1080 x 2400 px | |
| Protection | Corning Gorilla Glass 5 | |
| Touchscreen | Yes, Capacitive Touchscreen, Multi-touch | capacitive touchscreen |
| Screen format | 19:9 | |
| Screen-to-Body Ratio | 84.5% | |
| PPI /points per inch/ | 407 ppi | |
| Display area | 107.4 cm2 | |
| Display aspect ratio | 20:9 (height:width) | |
| Screen Protection | Corning Gorilla Glass v3, | |
| Pixel Density | 395 PPI | |
| Colors | 16M | |
| Other | 450 nits typ. brightness (advertised) | |
| Connectivity | OPPO A4 | Xiaomi Redmi Note 9 Pro |
| 4G Bands | TD-LTE 2300(band 40), FD-LTE 1800(band 3) | |
| Network Support | 4G, 3G, 2G | |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | |
| SIM Slot(s) | Dual SIM, GSM GSM | |
| 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 |
| USB Connectivity | Mass storage device, USB charging | |
| VoLTE | Yes | |
| Network | GSM / HSPA / LTE | |
| SIM card | SIM1: Nano, SIM2: Nano | Dual SIM (Nano-SIM, dual stand-by) |
| Bluetooth | Yes, v5.1 | 5.0, A2DP, LE |
| Edge | Yes | |
| GPRS | Yes | |
| GPS | Yes with A-GPS | 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 A4 | Xiaomi Redmi Note 9 Pro |
| Camera Setup | Dual | |
| Autofocus | Yes | |
| Camera Features | Digital Zoom, Auto Flash, Face detection, Touch to focus | |
| Flash | Yes, LED Flash | |
| Image Resolution | 4616 x 3464 Pixels | |
| Main camera | 16 MP f/1.8, Primary Camera, 2 MP, | 48 MP, Quad |
| Video Recording | 1920x1080 @ 30 fps | |
| 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 | 8 MP f/2.2, Primary Camera, | 16 MP, Single |
| Multimedia | OPPO A4 | Xiaomi Redmi Note 9 Pro |
| Headphone jack | 3.5 mm | |
| Loudspeaker | Yes | |
| 3.5 mm Jack | Yes | |
| Radio | FM radio, recording | |
| Design | OPPO A4 | Xiaomi Redmi Note 9 Pro |
| 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 | 209 g | |
| Other features | OPPO A4 | Xiaomi Redmi Note 9 Pro |
| Fingerprint Sensor | No | |
| Other Sensors | Light sensor, Proximity sensor, Accelerometer | |
| Battery | OPPO A4 | Xiaomi Redmi Note 9 Pro |
| Capacity | 4230 mAh | |
| Type | Li-ion | |
| Removable | No | |
| Quick Charging | Yes, VOOC, 20W | |
| USB Type-C | Yes | |
| Battery capacity | 5020 mAh, Non-removable Li-Po | |
| Other | OPPO A4 | Xiaomi Redmi Note 9 Pro |
| Release date | 2020, March 12 | |
| Sensors | Fingerprint (side-mounted), accelerometer, gyro, proximity, compass , Infrared port |
