This is a USB-C Male to USB 3.1 (C), HDMI 4K, USB 3.1 Gen 2 (A), and RJ-45 travel docking station. It allows your USB 3.1 (C) equipped MacBook, laptop or PC to connect to any USB 3.1 (C), HDMI 4K, USB 3.1 Gen 2 (A), or RJ-45 equipped device, such as a monitor or projector. This also allows for high definition viewing on any HD capable device that is equipped with an appropriate port. Our video adapters are backed by a 3 year warranty and are guaranteed to work the first time.