This adapter by Delock emulates a monitor so that the signal source does not switch off the signal or change the resolution, even without a connected monitor. The adapter contains a standard set of EDID/DDC data, but it can also read and save the data of a connected monitor.

Specification:
• Connectors:
  Input: 1 x HDMI-A 19 pin male
  Output: 1 x HDMI-A 19 pin female
• Resolution up to 3840 x 2160 @ 60 Hz (depending on the system and the connected
  hardware)
• No external power supply needed
• 1 x LED indicator
• Plastic housing
• Colour: black
• Dimensions incl. connector (LxWxH): ca. 44.0 x 20.5 x 12.5 mm

Package content:
• EDID emulator
• User manual

Data sheet:
http://www.delock.de/produkt/63320/pdf.html?sprache=en