Specification of power connector 5 V, ground outside, plus inside Dimensions: inside: ca. 1.35 mm outside: ca. 3.5 mm length: ca. 9.65 mmSystem requirements Windows Vista/7/7-64/8.1/8.1-64/10/10-64 PC or laptop with a free active USB Type-A portPackage content USB 3.0 extension cable 5 mPackage Retail Box