Product
Xiaomi Mi 4s
Xiaomi Mi 4s
Xiaomi Mi Mix 2S
Xiaomi Mi Mix 2S
Battery
Charging 18W wired, QC2, 40% in 60 min 18W wired, QC3 7.5W wireless (Qi)
Type Li-Ion 3260 mAh, non-removable Li-Ion 3400 mAh, non-removable
Body
Build - Glass front (Gorilla Glass 4), ceramic back, aluminum frame
Dimensions 139.3 x 70.8 x 7.8 mm (5.48 x 2.79 x 0.31 in) 150.9 x 74.9 x 8.1 mm (5.94 x 2.95 x 0.32 in)
SIM Nano-SIM + Micro-SIM Nano-SIM + Nano-SIM
Weight 133 g (4.69 oz) 191 g (6.74 oz)
Comms
Bluetooth 4.1, A2DP 5.0, A2DP, LE
Infrared port Yes -
NFC No Yes
Positioning GPS, GLONASS, BDS GPS, GLONASS, BDS
Radio No No
USB USB Type-C USB Type-C 2.0
WLAN Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct
Display
Protection - Corning Gorilla Glass 4
Resolution 1080 x 1920 pixels, 16:9 ratio (~441 ppi density) 1080 x 2160 pixels, 18:9 ratio (~403 ppi density)
Size 5.0 inches, 68.9 cm2 (~69.9% screen-to-body ratio) 5.99 inches, 92.6 cm2 (~81.9% screen-to-body ratio)
Type IPS LCD IPS LCD
Features
Sensors Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass Fingerprint (rear-mounted), accelerometer, gyro, compass
  - Virtual proximity sensing
Launch
Announced 2016, February. Released 2016, March 2018, March. Released 2018, April
Status Discontinued Discontinued
Main Camera
Dual - 12 MP, f/1.8, (wide), 1/2.55", 1.4µm, dual pixel PDAF, 4-axis OIS 12 MP, f/2.4, (telephoto), 1/3.4", 1.0µm, AF, 2x optical zoom
Features Dual-LED dual-tone flash, panorama, HDR Dual-LED dual-tone flash, HDR, panorama
Single 13 MP, f/2.0, PDAF -
Video 1080p@30fps, 720p@120fps 4K@30fps, 1080p@30/120fps, 720p@240fps
Memory
Card slot microSDXC (uses shared SIM slot) No
Internal 64GB 3GB RAM 64GB 6GB RAM, 128GB 6GB RAM, 256GB 8GB RAM
  eMMC 5.0 UFS 2.1
Misc
Colors Black, White, Gold, Pink Black, White
Models - M1803D5XA
SAR - 0.54 W/kg (head)     1.59 W/kg (body)    
Network
2G bands GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 GSM 850 / 900 / 1800 / 1900
3G bands HSDPA 850 / 1900 / 2100 HSDPA 800 / 850 / 900 / 1700(AWS) / 1800 / 1900 / 2100
4G bands 1, 3, 7, 38, 39, 40, 41 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 27, 28, 29, 30, 34, 38, 39, 40, 41
Speed HSPA, LTE Cat4 150/50 Mbps HSPA 42.2/5.76 Mbps, LTE (3CA) Cat18 1200/100 Mbps
Technology GSM / CDMA / HSPA / LTE GSM / CDMA / HSPA / EVDO / LTE
  TD-SCDMA CDMA2000 1xEV-DO
Our Tests
Audio quality Noise -94.9dB / Crosstalk -82.6dB Noise -93.0dB / Crosstalk -92.5dB
Battery (old) Endurance rating 75h Endurance rating 59h
Camera Photo / Video -
Display Contrast ratio: 975:1 (nominal), 2.095 (sunlight) -
Loudspeaker Voice 73dB / Noise 68dB / Ring 82dB Voice 68dB / Noise 70dB / Ring 81dB
Performance Basemark OS II 2.0: 1545Basemark X: 12990 AnTuTu: 270814 (v7) GeekBench: 9158 (v4.4) GFXBench: 34fps (ES 3.1 onscreen)
Platform
Chipset Qualcomm MSM8992 Snapdragon 808 (20 nm) Qualcomm SDM845 Snapdragon 845 (10 nm)
CPU Hexa-core (4x1.4 GHz Cortex-A53 & 2x1.8 GHz Cortex-A57) Octa-core (4x2.8 GHz Kryo 385 Gold & 4x1.8 GHz Kryo 385 Silver)
GPU Adreno 418 Adreno 630
OS Android 5.1 (Lollipop), upgradable to 7.0 (Nougat), MIUI 10 Android 8.0 (Oreo), upgradable to Android 10, MIUI 12
Selfie camera
Single 5 MP, f/2.0 5 MP, f/2.0, (wide), 1/4.0", 1.4µm
Video 1080p@30fps 1080p@30fps
Sound
3.5mm jack Yes No
Loudspeaker Yes Yes