USB4™ is the most recent update in the evolution of USB. The maximum bandwidth is now 40Gbps double the previous best spec of 20Gbps (USB3.2 Gen 2x2). It is based on Thunderbolt 3 technology ensuring greater compatibility with all USB Type C and Thunderbolt 3 devices.
The Power Delivery over USB4 is bi-directional allowing power to flow to and from a connected device. It can transmit up to 80 Gigabits per second (Gbps) of DisplayPort video data utilizing all four high-speed lanes in the cable or up to 40 Gbps with simultaneous SuperSpeed USB data delivery.

