A battery eliminator circuit or BEC is a feature of some electronic speed controls which allows an electric model's drive battery to power the onboard radio system as well. The BEC can sense the voltage drop caused when the battery has little charge left in it. It then cuts the power to the drive motor in order to provide the control servo(s) with enough power to quickly bring the model safely back to the operator. In the case of an electric aircraft, the power to the propeller would be cut but the operation of the control surfaces would be maintained in order to perform a "dead stick" landing. Without this feature, all control would be lost when the battery expired, almost certainly resulting in the destruction of the model.