Connect USB drivers, keyboard, mice, external DVD burners to USB-C notebooks all together. The Lenovo USB-C to 4*USB-A Hub is an extension for USB-C notebook users who use multiple USB devices. Weighing only 42 grams, it's sleek and easy to fit in your pocket or carry case compartment, so you'll always have it handy. Note: Depending on the power capability of the host and the power consumption of the peripheral devices, the hub supports a maximum output current of up to 3 A in total. Depending on many factors such as the processing capability of the host and peripheral devices, file attributes, and other factors related to system configuration and operating environments, the actual data transfer rate may be slower than 5 Gbit/s on USB 3.1 Gen 1 (USB 3.0) connectors, slower than 10 Gbit/s on USB 3.1 Gen 2 connectors, and slower than 20Gbit/s on USB 3.2 connectors.