Rocstor 900E 10TB 7200RPM external Desktop, Built-In Power Supply, Silver Cover (G269L7-01) Built in power supply , direct (AC) Plug in to electricity (No bulky adaptor required) Enhanced with shock - absorbents mechanism Power: auto - switchable 240VA/100VA international use Fire wire 800, USB 3.0, east connectivity Compatible with both Windows and Mac Built in power supply , direct (AC) Plug in to electricity (No bulky adaptor required) Power: auto - switchable 240VA/100VA international use Fire wire 800, USB 3.0, east connectivity Compatible with both Windows and Mac