Product
Xiaomi Mi A2 (Mi 6X)
Xiaomi Mi A2 (Mi 6X)
Xiaomi Redmi K20
Xiaomi Redmi K20
Battery
Charging 18W wired, QC3 (Global) 18W wired, QC4 (India) 18W wired
Type Li-Po 3000 mAh, non-removable Li-Po 4000 mAh, non-removable
Body
Build Glass front, aluminum back, aluminum frame Glass front (Gorilla Glass 5), glass back (Gorilla Glass 5), aluminum frame
Dimensions 158.7 x 75.4 x 7.3 mm (6.25 x 2.97 x 0.29 in) 156.7 x 74.3 x 8.8 mm (6.17 x 2.93 x 0.35 in)
SIM Nano-SIM + Nano-SIM Nano-SIM + Nano-SIM
Weight 166 g (5.86 oz) 191 g (6.74 oz)
Comms
Bluetooth 5.0, A2DP, LE 5.0, A2DP, LE, aptX HD
Infrared port Yes -
NFC No Yes (China only)
Positioning GPS, GLONASS, BDS GPS, GLONASS, GALILEO, BDS
Radio No FM radio
USB USB Type-C 2.0 USB Type-C 2.0, OTG
WLAN 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
Display
Protection - Corning Gorilla Glass 5
Resolution 1080 x 2160 pixels, 18:9 ratio (~403 ppi density) 1080 x 2340 pixels, 19.5:9 ratio (~403 ppi density)
Size 5.99 inches, 92.6 cm2 (~77.4% screen-to-body ratio) 6.39 inches, 100.2 cm2 (~86.1% screen-to-body ratio)
Type IPS LCD Super AMOLED, HDR
Features
Sensors Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass Fingerprint (under display, optical), accelerometer, gyro, proximity, compass
Launch
Announced 2018, July 24. Released 2018, July 2019, May. Released 2019, June
Status Discontinued Discontinued
Main Camera
Dual 12 MP, f/1.8, 1/2.9", 1.25µm 20 MP, f/1.8, 1/2.8", 1.0µm, PDAF -
Features Dual-LED flash, HDR, panorama Dual-LED flash, HDR, panorama
Triple - 48 MP, f/1.8, 26mm (wide), 1/2.0", 0.8µm, PDAF 8 MP, f/2.4, 53mm (telephoto), 1/4.0", 1.12µm, PDAF, 2x optical zoom 13 MP, f/2.4, 12mm (ultrawide), 1/3.1", 1.12µm
Video 4K@30fps, 1080p@30fps (gyro-EIS), 720p@120fps 4K@30fps, 1080p@30/120/240fps, 1080p@960fps
Memory
Card slot No No
Internal 32GB 4GB RAM, 64GB 4GB RAM, 128GB 6GB RAM 64GB 6GB RAM, 128GB 6GB RAM, 256GB 8GB RAM
  eMMC 5.1 UFS 2.1
Misc
Colors Black, Gold, Blue, Red, Rose Gold Carbon black, Red flame, Glacier blue, Pearl White
Models M1804D2SG, M1804D2SI, Mi A2, Mi 6X M1903F10I
SAR 0.96 W/kg (head)     0.64 W/kg (body)     1.07 W/kg (head)     0.72 W/kg (body)    
SAR EU 1.16 W/kg (head)     0.66 W/kg (body)     -
Network
2G bands GSM 850 / 900 / 1800 / 1900 GSM 850 / 900 / 1800 / 1900
3G bands HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 - Global HSDPA 850 / 900 / 1900 / 2100
4G bands 1, 2, 3, 4, 5, 7, 8, 20, 38, 40 - Global 1, 3, 5, 7, 8, 34, 38, 39, 40, 41
Speed HSPA 42.2/5.76 Mbps, LTE (3CA) Cat12 600/150 Mbps HSPA, LTE
Technology GSM / CDMA / HSPA / LTE GSM / HSPA / LTE
  1, 3, 5, 7, 8, 34, 38, 39, 40, 41 - China -
Our Tests
Battery (old) Endurance rating 73h -
Camera Photo / Video -
Loudspeaker Voice 89dB / Noise 72dB / Ring 89dB -
Performance AnTuTu: 130927 (v7), 172886 (v8) GeekBench: 4625 (v4.4), 1157 (v5.1) GFXBench: 8.6fps (ES 3.1 onscreen) -
Platform
Chipset Qualcomm SDM660 Snapdragon 660 (14 nm) Qualcomm SDM730 Snapdragon 730 (8 nm)
CPU Octa-core (4x2.2 GHz Kryo 260 Gold & 4x1.8 GHz Kryo 260 Silver) Octa-core (2x2.2 GHz Kryo 470 Gold & 6x1.8 GHz Kryo 470 Silver)
GPU Adreno 512 Adreno 618
OS Android 8.1 (Oreo), upgradable to Android 9.0 (Pie), Android One Android 9.0 (Pie), upgradable to Android 10, MIUI 12
Selfie camera
Features LED flash, HDR HDR
Single 20 MP, f/2.2, (wide), 1/3", 0.9µm Motorized pop-up 20 MP, f/2.2, (wide), 1/3.4", 0.8µm
Video 1080p@30fps 1080p@30fps
Sound
3.5mm jack No Yes
Loudspeaker Yes Yes
  - 24-bit/192kHz Hi-Res audio