| Oppo A31 (2015) |
Xiaomi Redmi Note 9 Pro |
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| Hardware and OS | Oppo A31 (2015) | Xiaomi Redmi Note 9 Pro |
| Operating system | Android 4.4 (KitKat) | Android 10.0; MIUI 11 |
| Processor | Quad-core 1.2 GHz Cortex-A53 | Octa-core (2x2.3 GHz Kryo 465 Gold & 6x1.8 GHz Kryo 465 Silver) |
| Chipset | Qualcomm MSM8916 Snapdragon 410 (28 nm) | Qualcomm SM7125 Snapdragon 720G (8 nm) |
| GPU | Adreno 306 | Adreno 618 |
| Internal memory | 8GB 1GB RAM | 64GB 4GB RAM, 128GB 6GB RAM |
| External memory | microSDXC (dedicated slot) | microSDXC (dedicated slot) |
| Display | Oppo A31 (2015) | Xiaomi Redmi Note 9 Pro |
| Type | IPS LCD capacitive touchscreen, 16M colors | IPS LCD |
| Size | 4.5 inches, 55.8 cm2 | 6.67" inc |
| Resolution | 480 x 854 pixels, 16:9 ratio | 1080 x 2400 px |
| Protection | 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 | Oppo A31 (2015) | Xiaomi Redmi Note 9 Pro |
| Camera | 8 MP, AF | |
| Features | LED flash | |
| Video | 1080p@30fps | |
| Selfie camera | Oppo A31 (2015) | Xiaomi Redmi Note 9 Pro |
| Camera | 5 MP | |
| Connectivity | Oppo A31 (2015) | Xiaomi Redmi Note 9 Pro |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | TD-SCDMA | HSDPA 850 / 900 / 1900 / 2100 |
| 4G Network | LTE band 38(2600), 39(1900), 40(2300), 41(2500) | 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 | 4.0, A2DP | 5.0, A2DP, LE |
| Technology | GSM / LTE | |
| Edge | Yes | Yes |
| GPRS | Yes | Yes |
| WLAN | Wi-Fi 802.11 b/g/n | |
| GPS | Yes, with A-GPS | Yes, with A-GPS, GLONASS, GALILEO, BDS, NavIC |
| Speed | TD-SCDMA, LTE Cat4 150/50 Mbps | HSPA 42.2/5.76 Mbps, LTE-A |
| USB | microUSB 2.0 | 2.0, Type-C 1.0 reversible connector |
| Camera | Oppo A31 (2015) | 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 | Oppo A31 (2015) | Xiaomi Redmi Note 9 Pro |
| Loudspeaker | Yes | |
| 3.5 mm Jack | Yes | Yes |
| Radio | No | FM radio, recording |
| Features | Oppo A31 (2015) | Xiaomi Redmi Note 9 Pro |
| Sensors | Accelerometer, proximity | |
| Design | Oppo A31 (2015) | Xiaomi Redmi Note 9 Pro |
| SIM | Dual SIM (Nano-SIM/ Micro-SIM, dual stand-by) | |
| Colors | White, Blue | Aurora Blue, Glacier White, Interstellar Black |
| Body build | Glass front (Gorilla Glass 5), glass back (Gorilla Glass 5), plastic frame | |
| Dimensions | 131.9 x 65.5 x 8 mm (5.19 x 2.58 x 0.31 in) | 165.8 x 76.7 x 8.8 mm |
| Weight | 135 g (4.76 oz) | 209 g |
| Battery | Oppo A31 (2015) | Xiaomi Redmi Note 9 Pro |
| Capacity | Non-removable Li-Ion 2000 mAh battery | |
| Stand-by | Up to 240 h | |
| Talk time | Up to 7 h | |
| Battery capacity | 5020 mAh, Non-removable Li-Po | |
| Other | Oppo A31 (2015) | Xiaomi Redmi Note 9 Pro |
| Release date | 2020, March 12 | |
| Sensors | Fingerprint (side-mounted), accelerometer, gyro, proximity, compass , Infrared port |
