The USB-COM+ is one Port RS-232 USB-to-Serial Adapter, with optional feature to supply power output of 5V, 200mA - upper case by sliding open for easy to supply DC 5V power, all are connected to one DB9 male connector. for the 5V 2000mA setting there is no need to open chassis to set operation modes as upper case can be sliding open. For more details on product, Please refer to http://www.papyrus.co.il/1-port_rs-232_usb-to-serial_adapter.htm