The screen power cable for the MT11 Kit is pre-installed in the XOOT_Pro arm. This power cable has 5.5x2.1 power connectors. However, many pen displays require 5.5x2.5 connectors.
These connectors look almost identical, but they will not reliably connect to each other. This can cause a situation where a power plug is inserted into a screen, but the screen will not power up.
To avoid this problem, use these power adapters on both sides of the screen power cable when the screen requires 5.5x2.5 connectors.
NOTE, This product only includes 2 power adaptors, the cable is not included.