The Lot of 9 QTY UC232A USB to Serial RS-232 Adapter is a set of black adapters from Cisco that allow for easy conversion between USB and Serial (RS-232) connections. With a 1:1 connection split/duplication, these adapters are compatible with universal brands and models. Each adapter has a USB connector A and a Serial (RS-232) male connector B, with a cable length of 16 inches. Perfect for connecting various devices and ensuring seamless communication, these adapters are a reliable and efficient solution for your networking needs.