The HTC Desire 820's screen size is 5.5 inches with 720 x 1280 pixels resolution.
There is a Qualcomm Snapdragon 615 Octa core 1.5 GHz processor (CPU).
The phone runs on the Android 4.4.2 KitKat (Update Available: 6.0.1 Marshmallow) operating system (OS).
You can take photos with the phone's onboard 13+ megapixel camera.
There is also a secondary front facing camera with 8+ megapixels resolution.
Internal memory is 16 GB. An external, MicroSD, MicroSDHC, microSDXC (up to 128 GB) expansion slot is available for increased storage capacity.
The phone is powered by a Lithium Polymer (Li-Pol), 2600 mAh battery. HTC's performance ratings are 1344 minutes, 550 minutes Wi-Fi surfing.