This right angle strain relief cable is recommended for users who want to communicate to their RW series printer from a USB host, but are unable to use the USB to RJ-45 cable. The USB port on the RW series of mobile printers is intended for setup and maintenance of the printer. For wired communications, Zebra recommends using a serial RJ-45 cable for connection with your RW printer's RS-232C serial port or this right angle USB cable.