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