Product
Xiaomi Mi 4
Xiaomi Mi 4
Xiaomi Redmi Y1 (Note 5A)
Xiaomi Redmi Y1 (Note 5A)
Battery
Charging 18W wired, QC2 -
Music play - Up to 75 h
Stand-by Up to 280 h (3G) Up to 240 h (3G)
Talk time - Up to 32 h (3G)
Type Li-Ion 3080 mAh, non-removable Li-Ion 3080 mAh, non-removable
Body
Build Glass front, plastic back, aluminum frame Glass front (Gorilla Glass 3), plastic back, aluminum frame
Dimensions 139.2 x 68.5 x 8.9 mm (5.48 x 2.70 x 0.35 in) 153 x 76.2 x 7.7 mm (6.02 x 3.00 x 0.30 in)
SIM Micro-SIM Nano-SIM + Nano-SIM
Weight 149 g (5.26 oz) 153 g (5.40 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 microUSB 2.0
WLAN Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, DLNA, hotspot Wi-Fi 802.11 b/g/n, Wi-Fi Direct
Display
Protection - Corning Gorilla Glass 3
Resolution 1080 x 1920 pixels, 16:9 ratio (~441 ppi density) 720 x 1280 pixels, 16:9 ratio (~267 ppi density)
Size 5.0 inches, 68.9 cm2 (~72.3% screen-to-body ratio) 5.5 inches, 83.4 cm2 (~71.5% screen-to-body ratio)
Type IPS LCD IPS LCD
Features
Sensors Accelerometer, gyro, proximity, compass, barometer Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass
Launch
Announced 2014, July. Released 2014, August 2017, November. Released 2017, November
Status Discontinued Discontinued
Main Camera
Features LED flash, panorama, HDR LED flash, HDR, panorama
Single 13 MP, f/1.8, 1/3.1", 1.12µm, AF 13 MP, f/2.2, 1/3.1", 1.12µm, PDAF
Video 4K@30fps, 1080p@30fps, 720p@120fps, HDR 1080p@30fps
Memory
Card slot No microSDXC (dedicated slot)
Internal 16GB 2GB RAM, 64GB 3GB RAM 32GB 3GB RAM, 64GB 4GB RAM
  eMMC 5.0 eMMC 5.1
Misc
Colors Black, White Gold, Dark Grey, Silver, Rose Gold
Models 2014215 MDI6S, Redmi Y1, Redmi Note 5A
SAR 0.71 W/kg (head)     0.85 W/kg (body)     1.09 W/kg (head)     1.44 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, 4, 5, 7, 8, 20, 38, 40
EDGE Yes -
GPRS Yes -
Speed HSPA, LTE, EV-DO Rev.A 3.1 Mbps HSPA, LTE
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 -92.1dB / Crosstalk -89.7dB
Battery (old) Endurance rating 68h Endurance rating 74h
Camera Photo / Video Photo / Video
Display Contrast ratio: 929 (nominal), 2.424 (sunlight) Contrast ratio: 1673:1 (nominal), 2.556 (sunlight)
Loudspeaker Voice 62dB / Noise 62dB / Ring 66dB Voice 68dB / Noise 72dB / Ring 86dB
Performance - GeekBench: 2610 (v4.4) GFXBench: 5.6fps (ES 3.1 onscreen)
Platform
Chipset Qualcomm MSM8974AC Snapdragon 801 (28 nm) Qualcomm MSM8940 Snapdragon 435 (28 nm)
CPU Quad-core 2.5 GHz Krait 400 Octa-core 1.4 GHz Cortex-A53
GPU Adreno 330 Adreno 505
OS Android 4.4.3 (KitKat), upgradable to 6.0.1 (Marshmallow), MIUI 10 Android 7.1.2 (Nougat), MIUI 11
Selfie camera
Single 8 MP, f/1.8 16 MP, f/2.5, (wide), 1/3.06" 1.0µm
Video 1080p@30fps 1080p@30fps
Sound
3.5mm jack Yes Yes
Loudspeaker Yes Yes