A set of a 4K UltraHD Blu-ray and Blu-ray for the film "Interstellar." *Ultra HD Blu-ray player is necessary to play this Ultra HD Blu-ray disc. Please note that it will not play on regular Blu-ray player. For optimal viewing experience of 4K UltraHD content, 4K/HDR TV is recommended, although it is also compatible with 4K TV and HV TV. [About 4K UltraHD] 4K UHD boasts high resolution of 3840 pixels x 2160 lines (8.3 megapixels, aspect ratio 16:9), which is twice the horizontal and vertical resolution compared to the 1080p HDTV format, with four times as many pixels overall.