UGREEN USB-C to 2.5G Ethernet Adapter (70446 / CM275)

Name: UGREEN USB-C to 2.5G Ethernet Adapter (70446 / CM275)
Brand: UGREEN

This is what matters about UGREEN USB-C to 2.5G Ethernet Adapter (70446 / CM275).

About

A Realtek RTL8156 2.5Gbps adapter with an aluminum shell for heat dissipation and strain relief. UGREEN explicitly does not support Linux or ChromeOS — a disqualifying gap for SteamOS-based handhelds like Steam Deck, which are Linux derivatives.

Ports: 1× Ethernet (2.5GBASE-T) and 1× USB-C (fixed 10cm cable)

Confirmed with

Notebook (generic)
Official UGREEN documentation names specific notebook models certified: Apple MacBook (Pro 2016-2019, Air, 12"), Dell XPS 13/15, Dell G7/G5, Huawei MateBook, Microsoft Surface, Lenovo Yoga/ThinkPad, HP Spectre, ASUS ZenBook. The manufacturer explicitly states it does NOT support Linux, Chrome OS, or Android — a relevant negative signal for SteamOS-based handhelds, which were not tested and are not claimed compatible.