Brand/Manufacture
Oppo
Xiaomi
Model
Oppo A31
Xiaomi Redmi 9
Code Name
CPH2015, CPH2073, CPH2081, CPH2029, CPH2031
M2004J19G, M2004J19C
Announcement Date
13 February, 2020
10 June, 2020
Official Release
14 February, 2020
10 June, 2020
Official Availability
Available.
Available.
Release Country
Global
Global
Screen Size
6.5 inches, 102.0 cm2 (~82.4% screen-to-body ratio),
6.53 inches, 104.7 cm2 (~83.2% screen-to-body ratio),
Resolution & Pixel Density
720 x 1600 pixels, 20:9 ratio, ~270 ppi density
1080 x 2340 pixels, 19.5:9 ratio, ~395 ppi density
Brightness/Color Depth
480 nits (typ)
400 nits (typ)
Panel Type
IPS LCD, 480 nits (typ)
IPS LCD, 400 nits (typ)
Extra Feature
Corning Gorilla Glass 3, N/A
Corning Gorilla Glass 3, N/A
Dimensions (Size)
163.9 x 75.5 x 8.3 mm (6.45 x 2.97 x 0.33 in)
163.3 x 77 x 9.1 mm (6.43 x 3.03 x 0.36 in)
Physical Weight
180 g (6.35 oz)
198 g (6.98 oz)
Body Materials
Glass front (Gorilla Glass 3), plastic back, plastic frame
Glass front (Gorilla Glass 3), plastic back, plastic frame
Color Variant
Fantasy White, Mystery Black, Lake Green
Carbon Gray, Sunset Purple, Ocean Green, Pink/Blue
RAM & ROM Variant
64GB, 128GB, 128GB
32GB, 64GB, 128GB, 128GB
Processor Variant
Mediatek MT6765V/CB Helio P35 (12 nm)
Mediatek MT6769V/CU Helio G80 (12 nm)
Core Chipset (CPU)
Mediatek MT6765V/CB Helio P35 (12 nm)
Mediatek MT6769V/CU Helio G80 (12 nm)
Graphics Power (GPU)
PowerVR GE8320
Mali-G52 MC2
Operating System (OS)
Android 9.0 (Pie), ColorOS 6.1
Android 10, upgradable to Android 12, MIUI 13
Sensor/lens
8 MP, f/2.0, (wide), 1/4.0", 1.12µm
8 MP, f/2.0, 27mm (wide), 1/4.0", 1.12µm
Video Recording
1080p@30fps
1080p@30fps
Features/Modes
HDR
HDR
Sensor/lens
12 MP, f/1.8, (wide), 1/2.86", 1.25µm, PDAF2 MP, f/2.4, (macro)2 MP, f/2.4, (depth)
N/A
Telephoto Lens
No
No
Ultrawide Lens
No
No
3D ToF Sensor or LiDAR Scanner
N/A
N/A
Video Capabilities
1080p@30fps
1080p@30fps
Features/Modes
LED flash, HDR, panorama
LED flash, HDR, panorama
Battery Capacity
Li-Po 4230 mAh
Li-Po 5020 mAh
Battery Type
non-removable
non-removable
Charging Methods
N/A
18W wired
Reverse Charging Support
No
No
Network Technology
GSM / HSPA / LTE
GSM / HSPA / LTE
SIM-Support
Dual SIM (Nano-SIM, dual stand-by)
Dual SIM (Nano-SIM, dual stand-by)
WiFi Version
Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct
Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct
Bluetooth Version
5.0, A2DP, LE
5.0, A2DP, LE
USB Type
microUSB 2.0, OTG
USB Type-C 2.0, OTG
NFC Supported
No
Yes (market/region dependent)
Headphone Jack Supported
Yes
Yes
FM Radio Supported
FM radio
Wireless FM radio (no wired headphones required)
Infrared Supported
No
Yes
Speakers
Yes
Yes
Dedicated Features
N/A
N/A
Durability (Water & Dust)
N/A
N/A
