Excellent, full compliant (4K / Son) and cheap
[DP Version V1.2 / 4Kx2K] VicTsing Mini DisplayPort (Mini DP) Thunderbolt to HDMI and VGA and DVI HDTV TV Video Converter ABS Case Compatible cable channels for Apple MacBook, MacBook Pro, iMac, Macbook Air, Mac Mini, Microsoft Surface 1 2 3 Pro, Thinkpad X1 Carbon Series (Electronics) 5
[DP Version V1.2 / 4Kx2K] VicTsing Mini DisplayPort (Mini DP) Thunderbolt to HDMI and VGA and DVI HDTV TV Video Converter ABS Case Compatible cable channels for Apple MacBook, MacBook Pro, iMac, Macbook Air, Mac Mini, Microsoft Surface 1 2 3 Pro, Thinkpad X1 Carbon Series (Electronics)
Works perfectly with my 15 "MacBook Pro: Connected to a 4K screen Philips, I could climb up to the native resolution 3840x2160 (4K) and multiple resolutions supported. The computer's sound passage to the TV via the HDMI port is supported in the settings and functions perfectly. All this for a very affordable price.