SIIGs 4-Port Industrial USB to RS-232 Serial with 15KV ESD instantly adds four high speed RS-232 serial ports to your desktop or notebook computer through an available USB port. This industrial grade USB to serial adapter supports serial port data transfer rate of up to 921.6 Kb/s with built-in 15KV ESD protection. It features 600W power input surge protection to safeguard your connected devices from unforeseen power surges, providing smooth and reliable data transferring performance. And it is wall and DIN rail-mount supported for easy integration to expand your serial device connectivity.