Dhruvgargj5The usb radio is the remote. You can do one of few things, control it from your computer though any bluetooth remotes (Playstation controller, Xbox Controller, etc), program a flight pattern for it using the API, Control it with your cell phone (you will need a USB-on the go adaptor).
Android: https://play.google.com/store/apps/details?id=se.bitcraze.crazyfliecontrol2&hl=en iOS: https://itunes.apple.com/us/app/crazyflie-2.0/id946151480?mt=8 Computer: http://www.bitcraze.se/download/