BLU J4 vs Microsoft Surface Duo 2
BLU J4
Microsoft Surface Duo 2
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Network
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2G networkGSM 850, 900, 1800, 1900GSM 850, 900, 1800, 1900
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3G networkHSDPA 850, 900, 1900, 2100HSDPA 850, 900, 1900, 2100
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4G network-LTE frequency band 1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 19, 20, 25, 26, 28, 29, 30, 38, 39, 40, 41, 42, 46, 48, 66, 71
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5G network-5G band 1, 2, 3, 5, 7, 20, 25, 28, 38, 41, 66, 71, 77, 78, 79 SA/NSA/Sub6 - global; 1, 2, 3, 5, 7, 20, 25, 28, 38, 41, 66, 71, 77, 78, 79, 257, 260, 261 SA/NSA/Sub6/mmWave - USA
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HSDPA speed21.1 Mbps42.2 Mbps
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HSUPA speed5.76 Mbps5.76 Mbps
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LTE speed-LTE-A (5CA) Cat20, 2000 Mbps download, 150 Mbps upload
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5G speed-6 Gbps download
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GPRSYesYes
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EDGEYesYes
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Availability
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Oficially announced2019-102021-09
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Status2019-102021-10
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Design
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BuildPlasticGlass front (Gorilla Glass Victus), glass back (Gorilla Glass)
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SIMDual SIM (Nano-SIM, dual stand-by)Nano-SIM, eSIM
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Height151 mm145.2 mm
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Width72.3 mm93.1 mm
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Thickness10 mm11 mm
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Height unfolded-184.5 mm
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Width unfolded-145.2 mm
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Thickness unfolded-5.5 mm
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Weight158 g284 g
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Stylus-Yes
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ColorsBlack, Blue, BrownGlacier, Obsidian
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Display
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Display typeIPS LCD capacitive touchscreenAMOLED capacitive touchscreen
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Physical size5.5 inches8.3 inches
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Resolution720 x 1440 pixels1892 x 2588 pixels
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Pixel density293 ppi401 ppi
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Display colors1677721616777216
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Protection-Corning Gorilla Glass Victus
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MultitouchYes-
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Display features-90Hz, HDR, 800 nits (peak)
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Cover display-AMOLED capacitive touchscreen
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Cover display physical size-5.8 inches
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Cover display resolution-1344 x 1892 pixels
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Hardware
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CPU-Octa-core
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CPUQuad-core 1.3 GHz Cortex-A7Single-core 2.84 GHz Kryo 680
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CPU(second)Triple-core 2.42 GHz Kryo 680
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CPU(third)Quad-core 1.80 GHz Kryo 680
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Chipset-Qualcomm SM8350 Snapdragon 888 5G
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GPUMali-400Adreno 660
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Memory RAM1 GB8 GB
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Internal storage32 GB128, 256, 512 GB
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Memory cardmicroSD, microSDHC, microSDXCNo
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Memory card max64 GB-
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StorageeMMC 5.1UFS
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OS
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OSAndroid 8.1 Oreo Go EditionAndroid 11
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Main camera
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Camera typeSingleTriple
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Main camera8 MP12 MP, (wide) , f/1.7 , 27 mm, 1.4 µm
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(telephoto) , 12 MP, f/2.4 , 51 mm, 1.0 µm, 2x optical zoom
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(ultrawide) , 13 MP, f/2.2 , 1.0 µm
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Primary camera video720p@30fps4K@30/60fps, 1080p@30/60/120/240fps, gyro-EIS, HDR
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Primary camera flashLED flash-
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Camera features-Autofocus, continuous shooting, digital zoom, digital image stabilization, geotagging, panorama, HDR, touch focus, face detection, white balance settings, ISO settings, exposure compensation, self-timer, scene-mode, macro-mode, phase detection autofocus
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Selfie camera
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Selfie camera type-Single
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Selfie camera8 MP12 MP, (wide) , f/2.0 , 24 mm, 1.0 µm
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Selfie camera video720p@30fps1080p@30fps
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Sound
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3.5mm jackYes-
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LoudspeakerYesYes, with stereo speakers
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EarpieceYes-
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Multimedia
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RadioFM RadioNo
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Connectivity
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WLANWi-Fi 802.11b, 802.11g, 802.11nWi-Fi 802.11a, 802.11b, 802.11g, 802.11n, 802.11n 5GHz, 802.11ac, 802.11ax
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WLAN WiFi HotspotYesWi-Fi hotspot
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WLAN WiFi DirectYesWi-Fi direct
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WLAN WiFi Dual Band-Dual-band
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USBmicroUSB 2.0Type-C 3.2, DisplayPort
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Bluetoothv4.1v5.1
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Bluetooth A2DPYesA2DP
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bluetooth LEYesLE
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Bluetooth AptX-aptX Adaptive
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GPSYes, with A-GPSYes, with A-GPS
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Features
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SensorsAccelerometerDual accelerometer, dual compass, fingerprint, dual gyroscope, dual proximity
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Browser
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HTMLHTML5HTML5
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Battery
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Battery typeLi-PoLi-Po
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Battery capacity2200 mAh4449 mAh
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Battery removableRemovableNon-removable
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Fast battery charging-Yes, 23W
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Talk time 4G-28 h
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Cost
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Price75 USD1900 USD
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Tests and performance
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Antutu-750000 (v9)
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Geekbench(single-core)-1091 (v5.4)
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Geekbench(multi-core)-3517 (v5.4)
