Product
Xiaomi Mi 4
Xiaomi Mi 4
Xiaomi Mi A1 (Mi 5X)
Xiaomi Mi A1 (Mi 5X)
Battery
Charging 18W wired, QC2 10W wired
Stand-by Up to 280 h (3G) -
Type Li-Ion 3080 mAh, non-removable Li-Po 3080 mAh, non-removable
Body
Build Glass front, plastic back, aluminum frame Glass front (Gorilla Glass 3), aluminum back, aluminum frame
Dimensions 139.2 x 68.5 x 8.9 mm (5.48 x 2.70 x 0.35 in) 155.4 x 75.8 x 7.3 mm (6.12 x 2.98 x 0.29 in)
SIM Micro-SIM Nano-SIM + Nano-SIM
Weight 149 g (5.26 oz) 165 g (5.82 oz)
Comms
Bluetooth 4.0, A2DP 4.2, A2DP, LE
Infrared port Yes Yes
NFC No No
Positioning GPS, GLONASS, BDS GPS, GLONASS, BDS
Radio FM radio FM radio
USB microUSB 2.0, OTG USB Type-C 2.0
WLAN Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, DLNA, hotspot Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct
Display
Protection - Corning Gorilla Glass 3
Resolution 1080 x 1920 pixels, 16:9 ratio (~441 ppi density) 1080 x 1920 pixels, 16:9 ratio (~403 ppi density)
Size 5.0 inches, 68.9 cm2 (~72.3% screen-to-body ratio) 5.5 inches, 82.6 cm2 (~70.1% screen-to-body ratio)
Type IPS LCD IPS LCD
Features
Sensors Accelerometer, gyro, proximity, compass, barometer Fingerprint (rear-mounted), accelerometer, gyro, proximity
Launch
Announced 2014, July. Released 2014, August 2017, September. Released 2017, September
Status Discontinued Discontinued
Main Camera
Dual - 12 MP, f/2.2, 26mm (wide), 1/2.9", 1.25µm, PDAF 12 MP, f/2.6, 50mm (telephoto), 1.0µm, AF, 2x optical zoom
Features LED flash, panorama, HDR Dual-LED dual-tone flash, HDR, panorama
Single 13 MP, f/1.8, 1/3.1", 1.12µm, AF -
Video 4K@30fps, 1080p@30fps, 720p@120fps, HDR 4K@30fps, 1080p@30fps, 720p@120fps
Memory
Card slot No microSDXC (uses shared SIM slot)
Internal 16GB 2GB RAM, 64GB 3GB RAM 32GB 4GB RAM, 64GB 4GB RAM
  eMMC 5.0 eMMC 5.1
Misc
Colors Black, White Black, Gold, Rose Gold, Red
Models 2014215 MDG2, MDI2
SAR 0.71 W/kg (head)     0.85 W/kg (body)     1.75 W/kg (head)     0.76 W/kg (body)    
Network
2G bands GSM 850 / 900 / 1800 / 1900 - all versions GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
3G bands TD-SCDMA - 4G model HSDPA 850 / 900 / 1900 / 2100
4G bands 38, 39, 40 - 4G model 1, 3, 5, 7, 8, 20, 38, 40
EDGE Yes -
GPRS Yes -
Speed HSPA, LTE, EV-DO Rev.A 3.1 Mbps HSPA 42.2/5.76 Mbps, LTE (2CA) Cat6 300/50 Mbps
Technology GSM / CDMA / HSPA / EVDO / LTE GSM / HSPA / LTE
  CDMA2000 1xEV-DO - Telecom 3G model -
Our Tests
Audio quality Noise -91.6dB / Crosstalk -49.7dB Noise -91.0dB / Crosstalk -82.5dB
Battery (old) Endurance rating 68h Endurance rating 87h
Camera Photo / Video Photo / Video
Display Contrast ratio: 929 (nominal), 2.424 (sunlight) Contrast ratio: 1570:1 (nominal), 2.689 (sunlight)
Loudspeaker Voice 62dB / Noise 62dB / Ring 66dB Voice 74dB / Noise 73dB / Ring 90dB
Performance - GeekBench: 4292 (v4.4) GFXBench: 3.5fps (ES 3.1 onscreen)
Platform
Chipset Qualcomm MSM8974AC Snapdragon 801 (28 nm) Qualcomm MSM8953 Snapdragon 625 (14 nm)
CPU Quad-core 2.5 GHz Krait 400 Octa-core 2.0 GHz Cortex-A53
GPU Adreno 330 Adreno 506
OS Android 4.4.3 (KitKat), upgradable to 6.0.1 (Marshmallow), MIUI 10 Android 7.1.2 (Nougat), upgradable to Android 9.0 (Pie), Android One
Selfie camera
Single 8 MP, f/1.8 5 MP
Video 1080p@30fps 1080p@30fps
Sound
3.5mm jack Yes Yes
Loudspeaker Yes Yes