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