If your computer's USB port can provide enough power to drive the pen display at maximum brightness, there's no need to attach the additional cable for more power. The connector for the 3-to-2 cable looks tough and the cables are quite thick. If your computer has a USB-C port which can output video signal, definitely use the USB-C cable connection since it reduces cable clutter. The other end has two USB-C connectors (one video, one data) One end has full-sized HDMI, USB-A for data, and USB-A (red coloured) for power. Huion has redesigned the old 3-to-1 cable into a 3-to-2 cable. I don't have any issues to highlight for the hardware but there are some minor driver related issues.

If you have the budget, these are definitely products to consider. Just to give you the bottom line up front, these new 1440P or 2.5K resolution pen displays have fantastic drawing performance and terrific colour support. Their other 1440P models are the Kamvas Pro 24 (2020), Kamvas 24 and Kamvas 24 Plus (2021) ( review). Prices are US $399 and $599 respectively. Huion has finally added 1440P resolution to their small and mid-size pen displays with the release of the Kamvas Pro 13 (2.5K) and Kamvas Pro 16 (2.5K).

Krita huion kamvas 13