Serial conversion adapter (model number: USB-RSAQ5) from I/O DATA. Items for sale: * Main unit * USB connection cable, approximately 1m I have confirmed that it works correctly by downloading the driver on my PC (Windows 10). There are no noticeable scratches or stains, but there are some minor scuff marks. Instruction manual and outer box are not included. I will carefully clean and package it with消毒用アルコール (disinfecting alcohol). Shipping will be via Nekopos (Yamato Transport's mail delivery service). It will be delivered to your mailbox, but I will wrap the main unit in bubble wrap and then put it in an envelope, and protect it with a plastic bag as a rain対策 (rain protection). Please consider purchasing if you are interested!