Lei Jun, founder and CEO of China's mobile company Xiaomi, shows the new features at a launch ceremony of Xiaomi Phone 4, in Beijing, July 22, 2014. China's Xiaomi unveiled on Tuesday its new flagship Mi 4 smartphone, aimed squarely at the premium handset market dominated by Apple Inc and Samsung Electronics Co Ltd. Xiaomi is rumoured to be working on a successor tablet for the Xiaomi Mi Pad 7.9 that was released last year in March.