There's a port for an external power supply but its related straight to the 5V line Therefore if you should externally power, we advise prying open the case and reducing the crimson 5V line in the USB connection.
If https://www.leo-brand.com/products/qvs-db9-female-to-female-slim-gender-changer
The QVS DisplayPort F-to-F Digital A/V UltraHD Gender Changer/Coupler" Diaries
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