Lenovo K4 Note Dual Sim, 16GB LTE Unlocked Phone (Black) 5.5" (13.97cm) full HD 1920 x 1080 pixels IPS screen Gorilla glass display with 401ppi resolution - 450 Nits brightness & contrast ratio of 1000:1 First phone with TheaterMax technology and Dolby Atmos surround sound over speakers 13MP f2.2 primary camera with 5P lens element, dual LED dual tone flash, 5MP front camera with 4P lens element Android v5.1 OS with 1.3 GHz Mediatek 6753 64-bit octa core processor, ARM Mali T720 GPU, 3 GB DDR3 RAM, 16GB internal memory (expandable up to 128GB) and dual micro SIM dual standby (4G+4G) 3300mAH lithium-ion battery with Fast Charger 2.0 providing talk-time of 29 hours