These A to A cables are Designed for Testing Only! The USB 3.0 specification is the combination of the physical SuperSpeed bus combined in parallel with the physical USB 2.0 bus. Cable is 4 wire. The data wires are 28 AWG, the power wires are 20 to 28 AWG. Two power lines are un-twisted and 2 data lines, twisted. Longer cables will use 20 AWG for power. The wire are color coded per the drawing above. Cables will have an A plug on one end an a B plug on the opposite end. The maximum cable length is 5 meters; however that can be increased by using Hubs. The USB interface is designed to operate down to -20 degrees C.