Connector Type(s): 1 - USB 2.0 Type-A (4 pin, 480Mbps), External Ports: 4 - DB-9 (9 pin, D-Sub), Ports: 4, Interface: Serial, Bus Type: USB 2.0, Port Style: External Hub, Chipset ID: FTDI - FT232RL, Serial Protocol: RS-232, Max Baud Rate: 921.6 Kbps, FIFO: 256 Bytes, Color: Black, Material: Plastic, Cable Length: 1.8 m [6.0 ft]. This 4 Port USB to RS232 Serial Hub lets you connect up to four RS232 serial devices to your Mac or PC laptop or desktop computer through a single USB port, as though the computer offered built-on DB9M serial connectors.