Features - Easy way to add 4 RS-232 serial ports - Fully compliant with USB 1.1; USB 2.0 compatible - Supports RS-232 serial interface - Supports automatic handshake mode - Up to 115.2 Kbps data transfer rate for each serial port - Dual data buffers for each upstream and downstream data transfer - No IRQ, DMA, I/O address resources required - Supports hot-swapping and plug-and-play - Built-in 16KV ESD protection - Supports both bus power and external power - Works with cellular phones, PDAs, digital cameras, modems and ISDN terminal adapters - OS support - Windows 2000/2003/XP/NT Package Contents - 1x USB-to-Serial Hub - 1x USB Cable - 1x Installation Disk - 1x User Instructions