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vivo Y81i has Android 8.1 (Oreo), It offers an internal memory of 16 GB with 2 GB RAM, It presents a screen of HD+ resolution, And it comes with a battery capacity of 3260 mAh .

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vivo Y81i specifications

General

6602 Announce date : October, 2018
6602 Release date : November, 2018
6602 Height × Width : 155.1 mm x 75 mm (6.11 x 2.95 in)
6602 Thickness : 7.8 mm (0.31 in)
6602 Weight : 143 g (5.04 oz)
6602 SIM : Dual SIM (Nano-SIM, dual stand-by)
6602 Colors : Black, Red
6602 Build : Front glass, plastic body

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Display

6602 Display type : IPS LCD capacitive touchscreen, 16M colors
6602 Screen size : 6.22 inches (~83.0% screen-to-body ratio)
6602 Resolution : 720 x 1520 pixels [ HD+ resolution ]
6602 Pixel density : (~270 ppi pixel density)
6602 Multitouch feature :   yes
6602 Funtouch OS 4.0 :   yes
6602 Protection : Corning Gorilla Glass (unspecified version)

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Camera & Video

6602 Rear camera : 13 MP, f/2.2, PDAF
6602 Camera features : LED flash, HDR, panorama
6602 Video : 1080p@30fps [ Full HD video ]
6602 Front camera : 5 MP, f/2.2

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Memory

6602 Expandable memory : Card slot microSD, up to 256 GB
6602 Internal Memory : 16 GB
6602 RAM : 2 GB RAM

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Battery

6602 Battery type : Non-removable Li-Po
6602 Battery capacity : 3260 mAh

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Platform

6602 Operating System : Android 8.1 (Oreo)
6602 Chipset : Mediatek MT6762 Helio P22 (12 nm)
6602 Processor : Octa-core 2.0 GHz Cortex-A53
6602 Graphics : PowerVR GE8320

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Network

6602 2G bands : GSM 850 /900 /1800 /1900 – SIM 1 & SIM 2
6602 3G bands : HSDPA 850 / 900 / 2100
6602 4G bands : LTE
6602 Speed : HSPA 21.1/5.76 Mbps, LTE-A (2CA) Cat7 300/150 Mbps
6602 GPRS :   yes
6602 EDGE :   yes

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Sound

6602 Alert types : Vibration, MP3, WAV ringtones
6602 Loudspeaker :   yes
6602 3.5 mm jack :   yes
6602 Active noise cancellation with dedicated mic :   yes

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CONNECTIVITY

6602 WLAN : WLAN Wi-Fi 802.11 b/g/n, Wi-Fi Direct, hotspot
6602 Bluetooth : 5.0, A2DP, LE
6602 GPS :   yes, with A-GPS, GLONASS, BDS
6602 USB : MicroUSB 2.0, USB On-The-Go
6602 Radio : FM radio

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Features

6602 Sensors : Accelerometer, Compass, Proximity, Ambient light sensor
6602 Messaging : SMS (threaded view), MMS, Email, Push Email, IM
6602 Browser HTML5 :   yes
6602 MP3/WAV/eAAC+/FLAC player :   yes
6602 MP4/H.264 player :   yes
6602 Document viewer :   yes
6602 Photo/video editor :   yes

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vivo Y81i disadvantages

6602 NFC :   No
6602 Removable battery :   No
6602 Water & Dust resistant :   No
6602 Fingerprint sensor :   No
6602 Fast battery charging :   No