At the Nokia & Microsoft Press Conference held in New York 
In terms of other features, Nokia Lumia 820 is internally built with an 8 megapixel Carl Zeiss lens, supporting 1080P HD video recording. And it is powered by a 1.5GHz Qualcomm Snapdragon S4 dual-core processor and features 1GB RAM +8 GB storage spaces, which lead us to believe that performance won't be an issue with the smartphone. The device offers Wireless Charging, NFC Enabled, 3G and WI-Fi Connectivity, Bluetooth, MicroUSB with 1650 mAh Battery  along with GPS, A-GPS and GLONASS.
Nokia Lumia 820’s optional accessories are very characteristic. This smartphone can be equipped with rechargeable cover and wireless charging pillows. And Nokia has began to popularize the public wireless charging points in the United States, I believe in the near future, Nokia mobile phone users are expected to go out without chargers. In addition, the newly launched Nokia Lumia 820 will be available with red, yellow, grey, cyan, purple, white and black for users to choose from.


 
