The Lenovo Mini USB-C dock lets you expand your options and add powerful capabilities with just a single USB-C connection.. Charge any legacy device with USB-A ports and effortlessly add an extra 4K or HD display, enterprise networking, and an external 3.5mm combo audio jack. Depending on many factors such as the processing capability of peripheral devices, file attributes, and other factors related to system configuration and operating environments, the actual transfer rate using the various USB connectors on this device will vary and is typically slower than the data rates as defined by the respective USB specifications: - 5 Gbit/s for USB 3.1 Gen 1; 10 Gbit/s for USB 3.1 Gen 2 and 20 Gbit/s for USB 3.2.