GameSir G-Crux is a brand new APP that allows you to update GameSir G5 and play games by connecting iPhone. when you get the item, please update the latest version and then add a Config and Start Gaming. There is no need to buy a remapper anymore.Some popular mobile games do not support gamepad natively. To force them controllable with gamepads, GameSir requires you to use GameSir World app to create a button overlay on the screen allowing GameSir product to control the game(Android). We promise you that GameSir never-ever manipulates the game's internal data, and never modifies and harms your smartphone system.