The Acer Liquid S2 is the newest Android flagship from the device manufacturer with some drool worthy specs in tow. One of its special features is its 13 megapixel rear camera which is capable of capturing video at a staggering 4K resolution. This feat makes the Acer Liquid S2 is the first smartphone capable of recording video in Ultra high definition.4K is the stage after full (1080p) HD and the video standard that will be best experienced on those new Ultra HD television sets. The thought that a smartphone brings that level of processing power inside it is quite impressive.