Lumia 820 has got 4.3 inch WVGA display screen with resolution of 800*480. It runs on Qualcomm Snapdragon S4 dual core processor. It has 1 GB of RAM and 8 GB of internal memory, it do support microSD card and 7 GB free SkyDrive storage on cloud.
It has 8 MP rear camera which can shot full HD videos, for video calling you had a VGA camera at front. Lumia 820 will be available in Grey, Red, Yellow, Cyan, Purple, White and Black colors with exchangeable back covers.
It has 1,650 mAh battery which support Qi standard wireless charging technology but you need to get additional shell to get it charged wirelessly.