I believe this will work for those using a 10-gigabit fiber optic line. The 10Gbs adapters on Amazon easily exceed 10,000 yen, so I think this is a great deal. LAN adapter It has 2 ports. It comes with a cooling fan. Due to shipping costs, please install the fan yourself. I do not recommend 10Gb adapters without a fan, as they get hot enough to cause burns. ⚠️ Especially, 1-port 10-gigabit adapters have poor performance and are not recommended at all. Please research on Chatgpt. ⚠️ You need to install drivers ⚠️ You can download them from the Intel website. I will provide a download link in the comments after purchase. --------------- Even without a 10Gb router, switch, or hub, you can communicate by connecting the LAN adapters with a regular LAN cable, so please take advantage of this.