Plastic case
USB-COM-CBL
Adds one RS232 communication port to your laptop/pc/device
USB-2COM
Adds two RS232 communication ports to your laptop/pc/device
USB-4COM
Adds four RS232 communication ports to your laptop/pc/device
USB-8COM
Adds eight RS232 communication ports to your laptop/pc/device
Metal case
USB-COM-M
Adds one RS232 communication port to your laptop/pc/device
USB-16COM-RM
Adds sixteen RS232 communications ports to your laptop/pc/device
USB-2COM-M
Adds two RS232 communication ports to your laptop/pc/device
USB-32COM-RM
Adds 32 RS232 communications ports to your laptop/pc/device
USB-4COM-M
Adds four RS232 communication ports to your laptop/pc/device
USB-8COM-M
Adds eight RS232 communication ports to your laptop/pc/device