Supports all standard serial devices USB 1.1 compliant \"Plug & Play\" Connectors: 25 Way D Male to USB A Male Adapter No IRQ, I/O address or DMA memory address needed Powered from USB Bus with no external power supply required Cable length: 1.5m Compatible with Windows 95(OSR2.1)98/ME/2000/XP/Vista/7 and Mac OS 8.6 2 year warranty This USB to Serial Converter allows any modern USB equipped computer to connect to devices equipped with 25 Way serial RS-232 ports. Ideal for EPOS, process control, lab equipment etc.