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General

NameVivo X21iXiaomi Mi Band 4-
ModelX21iMi Band 4-
Price-Tk 2,400-

Network

Network TypeGSM / CDMA / HSPA / LTENo-
Network 2GGSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 CDMA 800 & TD-SCDMA--
Network 3GHSDPA 850 / 900 / 2100--
Network 4GLTE band 1(2100), 3(1800), 4(1700/2100), 5(850), 8(900), 38(2600), 39(1900), 40(2300), 41(2500)--
Network SpeedHSPA, LTE--
Network GPRSYes--
Network EDGEYes--

Display

Display TypeSuper AMOLED capacitive touchscreen, 16M Colors AMOLED On-cell capacitive touchscreen, 24bit colors depth-
Display Size6.28 inches, 98.4 cm2 (~85.0% screen-to-body ratio 0.95 inches, 2.41 cm-
Display Resolution1080 x 2280 pixels, 19:9 ratio 120 x 240 pixels, (~194 ppi density)-
Display MultitouchYes - Funtouch OS 4.0 120 x 240 pixels, (~194 ppi density)-
Display Density402 ppi density2.5D tempered glass, Anti-fingerprint coating Single touch button (wake up, go back)-

Camera

Primary Camera12MP (f/1.8, 1/2.5No-
Secondary Camera24MP--
Camera FeaturesGeo-tagging, Touch focus, Face detection, HDR, panorama--
Video[email protected]--

Body

Body Dimensions154.4 x 75 x 7 mm (6.08 x 2.95 x 0.28 in) 22.1g-
Body Weight159 g (5.61 oz)--
Body ColorBlack, Aurora White, Ruby RedBlack-
Body Build- Plastic Polycarbonate-

Launch

Launch AnnouncementMay, 2018 May, 2019-
Launch DateRelease May 19th, 2018Released June, 2019-

Platform

Operating SystemAndroid 8.1 Oreo Android 4.4 (KitKat)-
CPUOcta-core (4x2.0 GHz Cortex-A73 & 4x2.0 GHz Cortex-A53)--
GPUMali-G72 MP3--
ChipsetMediatek MT6771 Helio P60--

Memory

Memory Internal64GB, 128GB 16MB-
Memory ExternalmicroSD, up to 256GB (uses SIM 2 slot)No-
Ram4GB, 6GB 512KB-

Battery

Battery TypeNon-removable Li-Ion Battery Non-removable Li-Po-
Battery Capacity3425 mAh 135 mAh battery-

Multimedia

Fm RadioYesNo-

Sound

AudioVibration, MP3, WAV Ringtones Vibration, Ringtones-
LoudspeakerYes No-
3.5mm JackYes - 32-bit/192kHz audio - Active noise cancellation with dedicated mic--

Connectivity

WiFiWi-Fi 802.11 a/b/g/n/ac, dual-band, WiFi Direct, Hotspot BT5.0 BLE-
Bluetooth5.0, A2DP, LE Yes, v5.0-
USBmicroUSB 2.0, USB On-The-GoNo-
GPSYes, with A-GPS, GLONASSNo-

Features

SensorsFingerprint-rear-mounted, accelerometer, proximity, compass 3-axis accelerometer + 3-axis gyroscope, PPG heart rate sensor, Capacitive proximity sensor-
MessagingSMS(threaded view), MMS, Email, Push EmailSMS-
BrowserHTML5 No-
JavaNoNo-

Other

Made ByChinaChina-
Other FeaturesFast battery charging, MP4/H.264 player, MP3/WAV/eAAC+/FLAC player, Document viewer, Photo/video editorIP65 Water Resistant, Water Resistance Rating5 ATM, Charging time up to 2 hours, Wrist strap material Thermoplastic polyurethane, Wristband width18mm, Adjustable wrist strap length. Controlling App Mi Fit System requirements Android 4.4, iOS 9.0 or above Voice Recognition, Alarm, proximity sensor, pre-set watch face, customizable watch face, lock scree-