UNITEK HDMI 2.0 4K Premium High Speed Ultra HD 4K@60 40m Optical Cable. ULTRA HDMI 2.0 OPTICAL CABLE 4K 60Hz HDR 40m UNITEK. Maximum Resolution: 4K. Length [m] 40m. Such high resolution is particularly important when connecting large screens and in applications that require the highest image quality, such as virtual reality.