An electronic speed control or ESC is a device mounted onboard an electrically-powered R/C model in order to vary its drive motor's speed, its direction and even to act as a dynamic brake in certain controllers, perhaps even antilock braking. An ESC can be a discrete unit which plugs into the receiver's throttle control channel or incorporated into the receiver itself, as is the case in most toy-grade R/C vehicles. Some R/C manufacturers that install proprietary hobby-grade electronics in their entry-level vehicles, vessels or aircraft use onboard electronics that combine the two on a single circuit board. A sophisticated example of that type can be found on the E-flite Blade CP helicopter with its four-function module combining control surface mixing as well as acting as a receiver, gyros