iOS&Android Controller; F4 phone controller is a universal controller compatible with both mainstream mobile OS, supporting any games whose virtual buttons can be dragged, including Pubg, Knives Out, Rules of Survival, Call of Duty: Modern Warfare.Plug and Play Controller: Mobile Controller GameSir F4 dont need to connect Bluetooth or any apps. Compared to the traditional gaming controller, playing games become more safe and easily. Note: Remove the case before use.Delicate Inside Design: the shape of F4 is similar to the falcon, it is small and portable, take it in your pocket playing games everywhere. F4 controllers power switch is set as a invisible one, when you use it, it will turn on naturally.4 Burst Modes: F4 controller is a deadly weapon to take enemies down fast and it is armed with the selectoras the same as the real M4A1 does, which you can select a suitable burst mode according to the battlefield status.Short-Distance &Click Buttons: GameSir F4 helps you tackle any problems you may face in gaming. All buttons of F4 gaming controller are tested extremely to ensure up to 5 million times lifespan.