The aluminum gray Rocstor Portable 4-Port Hub USB-C to 4x USB-A 3.0 allows you to change your USB-C port into 4 USB-A 3.0 ports without the need for an external power supply because it is bus powered. This adapter increases your laptop's or desktop's connectivity through a single USB-C or Thunderbolt 3 or 4 port. The slim portable design is intended to be used on the go. The hub is compatible with a wide range of laptops and desktops such as MacBook, MacBook Air, MacBook Pro, Chromebook, and Microsoft Surface.