Product
Vivo Y71
Vivo Y71
Xiaomi Redmi S2 (Redmi Y2)
Xiaomi Redmi S2 (Redmi Y2)
Battery
Charging - 10W wired
Type Li-Ion 3360 mAh, non-removable Li-Po 3080 mAh, non-removable
Body
Build Glass front (Gorilla Glass 3), aluminum back, aluminum frame Glass front, plastic back, plastic frame
Dimensions 155.9 x 75.7 x 7.8 mm (6.14 x 2.98 x 0.31 in) 160.7 x 77.3 x 8.1 mm (6.33 x 3.04 x 0.32 in)
SIM Nano-SIM + Nano-SIM Nano-SIM + Nano-SIM
Weight 150 g (5.29 oz) 170 g (6.00 oz)
Comms
Bluetooth 4.2, A2DP, LE 4.2, A2DP, LE
Infrared port - Yes
NFC No No
Positioning GPS, GLONASS
Radio FM radio FM radio
USB microUSB 2.0, OTG microUSB 2.0
WLAN Wi-Fi 802.11 b/g/n, Wi-Fi Direct, DLNA Wi-Fi 802.11 b/g/n, Wi-Fi Direct
Display
Protection Corning Gorilla Glass 3 -
Resolution 720 x 1440 pixels, 18:9 ratio (~268 ppi density) 720 x 1440 pixels, 18:9 ratio (~269 ppi density)
Size 6.0 inches, 92.9 cm2 (~78.7% screen-to-body ratio) 5.99 inches, 92.6 cm2 (~74.5% screen-to-body ratio)
Type IPS LCD IPS LCD
Features
Sensors Accelerometer, gyro, proximity, compass Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass
Launch
Announced 2018, April. Released 2018, April 2018, May. Released 2018, May
Status Discontinued Discontinued
Main Camera
Dual - 12 MP, f/2.2, 1.25μm, PDAF 5 MP, f/2.4, (depth)
Features LED flash, HDR LED flash, panorama, HDR
Single 13 MP, f/2.2, PDAF -
Video 1080p@30fps 1080p@30fps (gyro-EIS)
Memory
Card slot microSDXC (dedicated slot) microSDXC (dedicated slot)
Internal 16GB 3GB RAM, 32GB 3GB RAM, 32GB 4GB RAM 32GB 3GB RAM, 64GB 4GB RAM
  eMMC 5.1 eMMC 5.1
Misc
Colors Black, Gold Gray, Gold, Rose Gold, Mesmerising Blue, Stunning Black
Models 1724, 1801i M1803E6G, M1803E6H, M1803E6I
SAR - 0.43 W/kg (head)     1.58 W/kg (body)    
Network
2G bands GSM 900 / 1800 GSM 850 / 900 / 1800 / 1900
3G bands HSDPA 850 / 900 / 2100 HSDPA 850 / 900 / 1900 / 2100
4G bands 1, 3, 5, 8, 38, 40, 41 1, 3, 4, 5, 7, 8, 20, 38, 40 - Global
Speed HSPA, LTE HSPA 42.2/5.76 Mbps, LTE (2CA) Cat6 300/50 Mbps
Technology GSM / HSPA / LTE GSM / CDMA / HSPA / LTE
  - 1, 3, 5, 7, 8, 34, 38, 39, 40, 41 - China
Our Tests
Audio quality - Noise -90.3dB / Crosstalk -93.1dB
Battery (old) - Endurance rating 92h
Camera - Photo / Video
Display - Contrast ratio: 1072:1 (nominal), 3.077 (sunlight)
Loudspeaker - Voice 68dB / Noise 69dB / Ring 82dB
Performance - AnTuTu: 77488 (v7) GeekBench: 4313 (v4.4) GFXBench: 7.4fps (ES 3.1 onscreen)
Platform
Chipset Qualcomm MSM8917 Snapdragon 425 (28 nm) Qualcomm MSM8953 Snapdragon 625 (14 nm)
CPU Quad-core 1.4 GHz Cortex-A53 Octa-core 2.0 GHz Cortex-A53
GPU Adreno 308 Adreno 506
OS Android 8.1 (Oreo), Funtouch 4 Android 8.1 (Oreo), upgradable to Android 9, MIUI 12
Selfie camera
Features - HDR, LED flash
Single 5 MP, f/2.2 16 MP, f/2.5, (wide), 1/3.06" 1.0µm
Video 1080p@30fps
Sound
3.5mm jack Yes Yes
Loudspeaker Yes Yes