HTC Desire 820G Plus 16 GB

Just 1 month ago(24.8.15) I bought this HTC mobile from Jomuna
Future Park.
Merket price is 18000-19000 tk.I have bought at 18000 tk because
I was a employee of samsung brand shop.My selling reason is
I have got another smartphone already.so I want buy
a Computer Graphics Card.I have all docoments.If You want
I will give you.
Specification:

Network: 2G Net GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 23G Net HSDPA 850 / 900 / 2100GPS Yes, with A-GPSSIM Dual SIM (Nano-SIM, dual stand-by)
Display Type :
5.5 inchesPPI ~267 ppiMultitouch Yes
IPS LCD capacitive touchscreen, 16M colorsSize- HTC Sense UI 6.0
 154.5 gm
Camera
Primary 13 MP, 4160 x 3120 pixelsFeatures Geo-tagging, touch focus, face detection, HDR, panorama, autofocus, LED flashVideo 1080p@30fpsSecondary 8 MP, 1080p
OS: Android OS 4.4.2
Hardware
Chipset Mediatek MT6592CPU Octa-core 1.7 GHz Cortex-A7GPU Mali-450MP4Sensors Accelerometer, proximity, compassMemory 16 GB, 1 GB RAMEx.Storage microSD, up to 32 GB

Multimedia
Alert Vibration; MP3, WAV ringtonesSpeakerphone 

Yes, with stereo speakers3.5mmJack YesRadio To be confirmed
Connectivity

GPRS YesEDGE YesSpeed HSPAWLAN Wi-Fi 802.11 b/g/n, hotspotBluetooth v4.0, A2DPUSB microUSB v2.0

Other features

Messaging SMS (threaded view), MMS, Email, Push EmailBrowser HTML5Colors Marble White, Dovetail grayJava NoMiscellaneous MP4/H.264/WMV player 
- MP3/eAAC+/WMA/WAV/Flac player 
- Document viewer 
- Photo/video editor

Power management
Battery Non-removable Li-Po 2600 mAh batteryStand-by
Up to 600 h (2G) / Up to 560 h (3G)Talk time
Up to 32 h (2G) / Up to 12 h (3G)

Availability :Announced 2015, MayStatus Available. Released 2015, June