The four port USB (Universal Serial Bus) 2.0 hub lets you connect up to four devices. Comes with a 5v power supply for use with high powered devices. Specification USB (Universal Serial Bus) 2.0 Compliant Supports High Speed (480 M Bps) Built in USB (Universal Serial Bus) type A cable USB (Universal Serial Bus) & ACPI Compliant Supports Over Current Protection Plug n Play Supports Windows 2000 XP Vista Win 7 MAC OS 8.6/9.x/10.x & Linux 2.4+ Contents 4 Port USB (Universal Serial Bus) 2.0 Hub 5v 1a power adaptor