The 4XRS232 flykantech.com 4 Port USB to RS232 Serial Hub allows you to connect up to four RS232 serial devices to your Mac or PC laptop or desktop computer using just one USB port, replicating the functionality of built-in DB9M serial connectors. Designed with space-saving in mind, the RS232 Serial Hub is compact and powered via the USB bus, eliminating the need for an external power adapter. It provides a cost-effective solution for bridging the compatibility gap between modern USB-capable computers and legacy RS232 serial peripherals.