Japanese electronics maker Sony has unveiled the world's first smartphone with 4K HDR display which records slow motion video at 960 frames per second. The phone, ‘Xperia XZ Premium’ has a 19-megapixel camera that has a memory-stacked sensor. The device which runs on Android Nougat and has 4 GB RAM and 64 GB inbuilt storage is priced at Rs 46,700.