HDMI 2.0 (sometimes labeled 'HDMI 60Hz') input.

4K 60Hz capable display without HDR (See below for HDR limitations and recommendations).

Apple computers with Intel graphics controllers and Thunderbolt, Thunderbolt 2, or Mini DisplayPort outputs (see below for known compatibility issues).Intel UHD, NVIDIA, or AMD graphics controller capable of 4K 60Hz output.Recommendations for 4K 60Hz displays: Computer: The adapter is also compatible with both AMD Eyefinity and NVIDIA Surround technologies. The adapter has passed the extensive testing requirements necessary for VESA certification, and is compliant with VESA Dual-Mode DisplayPort 1.2, High Bit Rate 2 (HBR2), and HDMI 2.0 standards. Additionally some Apple systems will not be capable of outputting audio from Thunderbolt 2 to the HDMI display. Only Macs with “official” 4K support from Apple will be capable of 4K output using this adapter, while most will be limited to 1080P output.

Please be aware that with an update to macOS Mavericks, Apple disabled 4K video output on the vast majority of Mac models-even models which previously were able to output 4K. Apple Notes: While our mDP adapters work with Apple Thunderbolt ports, the maximum supported resolution will depend on the model of Mac and monitor in use. This adapter supports resolutions up to 4K (3840x2160 60Hz) refresh rate for computer monitors and televisions with Standard Dynamic Range (SDR), 4K 30Hz with High Dynamic Range (HDR) capable televisions and monitors. Active adapters use an integrated chipset to convert the DisplayPort signal from the computer to a HDMI signal, compatible with HDMI displays. It won't be quite up to the quality you'll get from Apple's display, but if you need connections other than Thunderbolt, especially HDMI, it may be your closest option.Plugable's Mini DisplayPort to HDMI Active Adapter (MDP-HDMI) allows you to easily connect the Mini DisplayPort/Thunderbolt 2 output on your Mac or PC laptop, desktop, or tablet to virtually any HDMI-enabled display.

word on the street is that Monoprice's new 27' IPS Glass Panel Pro monitor is a worthy competitor. If you want a 27' display that is *similar* to Apple's 27' Thunderbolt Display, but offers the convenience of HDMI, DVI, and VGA connections. There were online rumors awhile back (when Thunderbolt Displays first came out) that Apple themselves was developing an adapter that would solve your problem, but as of right now those rumors appear to have been false - or at the very least, have not come to fruition yet.

An Apple Thunderbolt Display will only work with Thunderbolt - so that means no hooking it up to anything else - be it HDMI, DVI, VGA, or other video source. I have tried personally (and unsuccessfully) because I am stubborn, and wanted to be 100% sure myself. Just to tag on to what Malcolm said, there are no adapters to make it work with ANY other type of signal than Thunderbolt.

Thunderbolt 2 to hdmi adapter