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Nokia Lumia 820

Front camera: VGA 0.3 MP
Camera Flash Type: Short pulse high power dual LED
Processor type: Dual-core 1.5 GHz
Charging: Wireless charging with accessory cover
Maximum talk time (3G): 8.1 h
Maximum standby time: 15 days
Software release: Windows Phone 8.1 with Lumia Cya
Display size: 4.3 ''
Display resolution: WVGA (800 x 480)
Display colours: TrueColor (24-bit/16M)
Design details: Exchangeable shell
Other user interface features: Glance screen, Vibrating alerts, Voice Commands, Word flow keyboard
CPU name: Qualcomm® Snapdragon™ S4
Number of cores: Dual core
Clock rate: 1500 MHz
Main camera: 8.7 MP
Camera Focus Type: Auto focus with two-stage capture key
Camera digital zoom: 4 x

Download the device manual from here