Genuine Lenovo Ethernet Extension Adapter. ThinkPad accessory. For those who have lost theirs. Brand: Lenovo Model Number: EX280 P/N: SC10P42352 FRU: 01YU026 Thank you for viewing. I needed this item because I lost the original accessory when returning my company-issued PC. I purchased this as a new, unused item here, but then I found the original I had lost, so I no longer need this one and will sell it.