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Xiaomi Redmi 4 (4X)

vivo Y51 (2015)

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Xiaomi Redmi 4 (4X)
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Xiaomi Redmi 4 (4X)

vivo Y51 (2015)

Network
Technology GSM / HSPA / LTE GSM / HSPA / LTE
2G bands GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
3G Network HSDPA 850 / 900 / 1900 / 2100 HSDPA 850 / 900 / 2100
4G Network 1, 3, 5, 7, 8, 38, 39, 40, 41 LTE 850 / 900 / 1800 / 2100 / 2600 - Malaysia
  LTE 900 / 1800 / 2100 - Thailand, Indonesia
Speed HSPA 42.2/5.76 Mbps, LTE (2CA) Cat6 300/100 Mbps HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps
Launch
Announced 2017, May 2015, December. Released 2015, December
Status Available. Released 2017, May Discontinued
Body
Dimensions 139.2 x 70 x 8.7 mm (5.48 x 2.76 x 0.34 in) 143.8 x 71.7 x 7.5 mm (5.66 x 2.82 x 0.30 in)
Weight 150 g (5.29 oz) 157 g (5.54 oz)
Build Glass front (Gorilla Glass), aluminum back, aluminum frame, plastic ends
SIM Hybrid Dual SIM (Nano-SIM/ Micro-SIM, dual stand-by) Dual SIM
Display
Type IPS LCD IPS LCD
Size 5.0 inches, 68.9 cm2 (~70.7% screen-to-body ratio) 5.0 inches, 68.9 cm2 (~66.8% screen-to-body ratio)
Resolution 720 x 1280 pixels, 16:9 ratio (~294 ppi density) 540 x 960 pixels, 16:9 ratio (~220 ppi density)
Protection Corning Gorilla Glass (unspecified version)
Platform
OS Android 6.0.1 (Marshmallow), upgradable to 7.1.2 (Nougat), MIUI 11 Android 5.0.2 (Lollipop), Funtouch 2.5
Chipset Qualcomm MSM8940 Snapdragon 435 (28 nm) Qualcomm MSM8916 Snapdragon 410 (28 nm)
CPU Octa-core 1.4 GHz Cortex-A53 Quad-core 1.2 GHz Cortex-A53
GPU Adreno 505 Adreno 306
Memory
Card slot microSDXC (uses shared SIM slot) microSDXC (dedicated slot)
Internal 16GB 2GB RAM, 16GB 3GB RAM, 32GB 3GB RAM, 64GB 3GB RAM, 64GB 4GB RAM 16GB 2GB RAM
 eMMC 5.1 eMMC 4.5
Main Camera
Modules 13 MP, f/2.0, PDAF 8 MP, AF
Features LED flash, HDR, panorama LED flash, HDR, panorama
Video 1080p@30fps 1080p@30fps
Selfie Camera
Modules 5 MP, f/2.2 5 MP
Video 1080p@30fps 720p@30fps
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Sound
Loudspeaker Yes Yes
3.5mm jack Yes Yes
Comms
WLAN Wi-Fi 802.11 b/g/n, Wi-Fi Direct Wi-Fi 802.11 b/g/n, hotspot
Bluetooth 4.2, A2DP, LE 4.0, A2DP
Positioning GPS, GLONASS, BDS GPS, GLONASS, BDS
NFC No No
Infrared port Yes No
Radio FM radio FM radio
USB microUSB 2.0 microUSB 2.0
Features
Sensors Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass Accelerometer, proximity, compass
Battery
Type Li-Po 4100 mAh, non-removable Li-Ion 2350 mAh, non-removable
Stand-by Up to 432 h (3G)
Talk time Up to 36 h (3G)
Music play Up to 87 h
Misc
Colors Black, Gold White
SAR 0.77 W/kg (head)     0.83 W/kg (body)    
Models 2016060, 2016090, MAG138, MAE136, Redmi 4, Redmi 4X Y51L, Y51, 1707, Y51A
Price About 110 EUR About 130 EUR
Tests
Performance GeekBench: 1819 (v4.4)
GFXBench: 5.1fps (ES 3.1 onscreen)
Display Contrast ratio: 915 (nominal), 2.920 (sunlight)
Loudspeaker Voice 64dB / Noise 70dB / Ring 72dB
Audio quality Noise -94.3dB / Crosstalk -94dB
Battery (old) Endurance rating 80h

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