This converter by Delock expands the system by one RJ45 2.5 Gigabit LAN port.

NBASE-T for higher speed
Modern services and new technologies require higher bandwidths. NBASE-T technology enables speeds of 1 Gbps and 2.5 Gbps with conventional networking cables. The best possible transmission rate is set automatically.

System requirements:
• Linux Kernel 5.15 or above
• Windows 10/10-64/11
• A free M.2 key B or key M slot

Specification:
• Connectors:
  1 x M.2 key B+M male
  1 x 2.5 Gigabit LAN RJ45 jack
• Chipset: Intel i225V
• Interface: PCIe 2.0
• Form factor: M.2 2280
• Suitable for M.2 slot with key M or B based on PCIe
• Data transfer rate:
  Ethernet up to 10 Mbps (Half/Full Duplex)
  Fast Ethernet up to 100 Mbps (Half/Full Duplex)
  Gigabit Ethernet up to 1000 Mbps (Half/Full Duplex)
  NBASE-T with up to 2.5 Gbps
• Compatible with:
  IEEE 802.3: 10BASE-T
  IEEE 802.3u: 100BASE-TX
  IEEE 802.3ab: 1000BASE-T
• Supports PXE
• Supports 9k Jumbo Frames
• LED indicator for link and activity
• Dimensions (LxWxH): ca. 80 x 22 x 16 mm

Package content:
• Converter
• Screw
• User manual

Data sheet:
http://www.delock.de/produkt/62985/pdf.html?sprache=en