ThinkRF uses male LEMO connector part number FGG.2B.302.CLAD62 for R5750.
Part can be found in Digikey if users wish to custom-made a longer power supply cable.
https://www.digikey.com/en/products/detail/lemo/FGG-2B-302-CLAD62/3798654
Please note other ThinkRF products may use a different LEMO connector.