expand: this adapter hub helps convert a usb port into 16 rs232 serial ports in an industrial rack-mountable chassis - and daisy chain multiple hubs for a scalable solution. broad compatibility: the 16-port hub features a reliable ftdi usb-to-serial chipset, which provides easy installation into a broad range of operating systems. built-in convenience: the 16-port hub features com port retention, ensuring that the same values are automatically re-assigned to the port, in the event it is disconnected and re-connected. sturdy construction: this rugged, rack-mountable hub fits into standard 19-inch server storage racks. it supports an extended operating temperature range of -40°c to 85°c (-40°f to 185°f). the startech.com advantage: startech.com offers a 2-year warranty and free lifetime technical support on this adapter hub and has been the choice of it professionals and businesses since 1995. Included components: 1-16-port USB to RS232 hub 1-USB cable 2-rack mounting brackets 8-rack mounting screws 2-DIN rail mounting brackets