Tripp Lite P137-06N-HD-UHD Keyspan Mini DisplayPort to HDMI Active Adapter Video Converter (M/F) - 4K, DP1.2, 6 in.

Connect a UHD HDMI TV to a Mac or PC with a Mini Displayport output
Active adapter for use with any Mini Displayport (or Thunderbolt 1 & 2) port
Converts Single-Mode and Dual-Mode (DP++) Mini DisplayPort output
Perfect for use with graphics cards, such as AMD Eyefinity, that do not output DP++ signals
Plug-and-play operation with no software required for easy, immediate installation
Supports Ultra High Definition (UHD) video resolutions up to 4K x 2K (3840 x 2160) @ 24/30 Hz
HDCP compliant
Transmits an audio signal as long as it is supported by the Mini DisplayPort; check the documentation for your Mini DisplayPort source for compatibility