Ucoax Thunderbolt 3 Cable for Mac [Intel Certified] 1m Length Supports 100W Charging, 40Gbps Data Transfer USB C, Ideal for Type-C Mac iMac MacBooks Pro Dell iPad Air 4 iPad Pro 2020 Pixel Hub Docking. The main function of Thunderbolt 3 is to provide high-speed data transfer and connectivity options for various devices. It supports data transfer speeds of up to 40 Gbps, which is four times faster than USB 3.1. This allows for quick transfer of large files and high-resolution media.