Product
Vivo X21 UD
Vivo X21 UD
Xiaomi Black Shark 2 Pro
Xiaomi Black Shark 2 Pro
Battery
Charging 18W wired 27W wired
Type Li-Ion 3200 mAh, non-removable Li-Ion 4000 mAh, non-removable
Body
Build Glass front (Gorilla Glass 3), aluminum back, aluminum frame Glass front, aluminum back, aluminum frame
Dimensions 154.5 x 74.8 x 7.4 mm (6.08 x 2.94 x 0.29 in) 163.6 x 75 x 8.8 mm (6.44 x 2.95 x 0.35 in)
SIM Nano-SIM + Nano-SIM Nano-SIM + Nano-SIM
Weight 156.2 g (5.50 oz) 205 g (7.23 oz)
Comms
Bluetooth 5.0, A2DP, LE 5.0, A2DP, aptX HD, LE
NFC No No
Positioning GPS, GLONASS GPS, GLONASS, GALILEO, QZSS, BDS
Radio FM radio No
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 Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct
Display
Protection Corning Gorilla Glass 3 -
Resolution 1080 x 2280 pixels, 19:9 ratio (~402 ppi density) 1080 x 2340 pixels, 19.5:9 ratio (~403 ppi density)
Size 6.28 inches, 98.4 cm2 (~85.2% screen-to-body ratio) 6.39 inches, 100.2 cm2 (~81.7% screen-to-body ratio)
Type Super AMOLED AMOLED
Features
Sensors Fingerprint (under display, optical), accelerometer, proximity, compass Fingerprint (under display, optical), accelerometer, gyro, proximity, compass
Launch
Announced 2018, March. Released 2018, March 2019, July. Released 2019, August
Status Discontinued Discontinued
Main Camera
Dual 12 MP, f/1.8, 1/2.55", 1.4µm, dual pixel PDAF 5 MP, f/2.4, (depth) 48 MP, f/1.8, 28mm (wide), 1/2.0", 0.8µm, PDAF 12 MP, f/2.2, 54mm (telephoto), 1.0µm, PDAF, 2x optical zoom
Features LED flash, HDR, panorama LED flash, HDR, panorama
Video 1080p@30fps 4K@30/60fps, 1080p@30/60/120fps, 720p@1920fps
Memory
Card slot microSDXC (uses shared SIM slot) No
Internal 128GB 6GB RAM 128GB 8GB RAM, 128GB 12GB RAM, 256GB 12GB RAM
  eMMC 5.1 UFS 3.0
Misc
Colors Black, Ruby Red Shadow Black, Iceberg Grey, Gulf Blue, Streamer Purple
Models X21UD A DLT-A0, DLT-H0
Network
2G bands GSM 850 / 900 / 1800 / 1900 GSM 850 / 900 / 1800 / 1900
3G bands HSDPA 850 / 900 / 1900 / 2100 HSDPA 850 / 900 / 1900 / 2100
4G bands 1, 2, 3, 5, 8, 34, 38, 39, 40, 41 1, 2, 3, 4, 5, 7, 8, 19, 20, 28, 34, 38, 39, 40, 41 - Global
Speed HSPA 42.2/5.76 Mbps, LTE (2CA) Cat6 300/50 Mbps HSPA 42.2/5.76 Mbps, LTE (5CA/3CA) Cat18 1200/150 Mbps
Technology GSM / CDMA / HSPA / LTE GSM / CDMA / HSPA / EVDO / LTE
  CDMA 800 & TD-SCDMA 1, 3, 4, 5, 7, 8, 34, 38, 39, 40, 41 - China
Platform
Chipset Qualcomm SDM660 Snapdragon 660 (14 nm) Qualcomm SM8150 Snapdragon 855+ (7 nm)
CPU Octa-core (4x2.2 GHz Kryo 260 Gold & 4x1.8 GHz Kryo 260 Silver) Octa-core (1x2.96 GHz Kryo 485 & 3x2.42 GHz Kryo 485 & 4x1.78 GHz Kryo 485)
GPU Adreno 512 Adreno 640 (700 MHz)
OS Android 8.1 (Oreo), Funtouch 4 Android 9.0 (Pie)
Selfie camera
Features - HDR
Single 12 MP, f/2.0, (wide), 1/2.8", 1.28µm 20 MP, f/2.0, (wide), 1/3", 0.9µm
Video 1080p@30fps 1080p@30fps
Sound
3.5mm jack Yes No
Loudspeaker Yes Yes, with stereo speakers
  32-bit/192kHz Hi-Res audio -