This is a set of PLC adapters made by Panasonic. They are used items, but I am selling them because I no longer need them. I have confirmed that they are working, and they have been initialized and paired, so you can use them immediately by plugging them into a power outlet. Although they are used items and have some scratches on the exterior, there are no problems with the electrical components. As shown in the photos, the set includes only the main units; there is no box, instruction manual, or LAN cables. If you want to know more about the operating instructions and specifications, please search online. The model numbers are BL-PA510 and BL-PA310, but they can be used without any problems. *Important Notes* This product does not guarantee high-speed communication simply by plugging it into a power outlet. It is significantly affected by the usage environment and surrounding devices. In my environment, I was actually using it at around 25Mbps. Please do not make any claims regarding unstable communication or not achieving the expected speed.