Portable Mini KeyboardUltra-small size,attached detachable USB-C cable,effectively saves desktop space. You can connect the mini keyboard (plug and play) and a normal-size keyboard with the same computer at the same time, they will not interfere with each other. Default functionThe default function of four keys is Up,Left,Down,Right.Plug and play,No software needed.Makes workflow super fast. Other functionYou can also use other functions, such as Shortcut keys, Multi-step operation, Multi-key in one, Undo, Redo, Play, Pause, Volume, Switch song, Forward, Backward, etc. You can control the light color and gradient mode of the case you want through the software or website. Programming by WebsiteThe Website is applicable to MacOS,Linux and also Windows Systems.We recommend that you try to use Chrome and Edge Browser to access the website! Website:SayoDevice.com DeviceProgramming will be saved on the device. You don't need to set it up again when you change the