• Add four additional RS-232 serial ports to any computer with a free USB port
• Provides serial connectivity to legacy free systems lacking RS-232 serial ports
• Supports wakeup and power management modes
• Bus powered, no external power adapter required
• Easy Plug-and-Play installation
• Fully compliant with USB 1.1 specifications and compatible with USB 2.0
• Provides you with four additional Straight-Through RS232 serial ports

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. The RS232 Serial Hub is compactly designed to preserve valuable workspace, and is bus-powered to eliminate the need for an external power adapter. A cost-effective solution that bridges the compatibility gap between modern USB-capable computers and legacy RS232 serial peripherals, this dependable USB/RS232 Serial Adapter hub is backed by StarTech.com's Lifetime Warranty.

Please feel free to ask if you have the product which I do not list.I will do my best to provide at competitive price.