An explansion board you insert into your computer so the computer can be connected to a network
StarTech.com 2 Port USB to RS232 RS422 RS485 Serial Adapter with COM Retention - TAA

StarTech.com 2 Port USB to RS232 RS422 RS485 Serial Adapter with COM Retention - TAA

StarTech.com
£94.99
StarTech.com 4 Port PCI Express Low Profile High Speed USB Card

StarTech.com 4 Port PCI Express Low Profile High Speed USB Card

StarTech.com
£39.99
StarTech.com 2 Port PCI Express PCIe SuperSpeed (5Gbps) USB 3.0 Card Adapter with UASP - LP4 Power

StarTech.com 2 Port PCI Express PCIe SuperSpeed (5Gbps) USB 3.0 Card Adapter with UASP - LP4 Power

StarTech.com
£30.99
StarTech.com 3-Port M.2 SSD (NGFF) Adapter Card - 1 x PCIe (NVMe) M.2, 2 x SATA III M.2 - PCIe 3.0 - TAA

StarTech.com 3-Port M.2 SSD (NGFF) Adapter Card - 1 x PCIe (NVMe) M.2, 2 x SATA III M.2 - PCIe 3.0 - TAA

StarTech.com
£38.99
StarTech.com PCI Express to 4 Slot PCI Expansion System - TAA

StarTech.com PCI Express to 4 Slot PCI Expansion System - TAA

StarTech.com
£380.99
StarTech.com 3 Port 2b 1a 1394 PCI Express FireWire Card Adapter

StarTech.com 3 Port 2b 1a 1394 PCI Express FireWire Card Adapter

StarTech.com
£66.99
StarTech.com 7 Port PCI USB Card Adapter - TAA

StarTech.com 7 Port PCI USB Card Adapter - TAA

StarTech.com
£22.99
ASUS Hyper M.2 x16 Gen5 Card interface cards/adapter Internal

ASUS Hyper M.2 x16 Gen5 Card interface cards/adapter Internal

ASUS
£77.99
ASUS IPMI EXPANSION CARD-SI interface cards/adapter Internal RJ-45, VGA

ASUS IPMI EXPANSION CARD-SI interface cards/adapter Internal RJ-45, VGA

ASUS
£95.99
ASUS ThunderboltEX 4 interface cards/adapter Internal Mini DisplayPort, PCIe, Thunderbolt, USB 2.0, USB 3.2

ASUS ThunderboltEX 4 interface cards/adapter Internal Mini DisplayPort, PCIe, Thunderbolt, USB 2.0, USB 3.2 Gen 2 (3.1 Gen 2)

ASUS
£90.99