DJI Original E310 20A 17.4V 3-4S Smart 420S ESC Replacement Electronic Speed Control for Quadcopter Multirotor Copters Multicopter Build-in spark-proof circuitry offers enhanced protection Duplex communication port allows easy firmware updates. Features a built in LED to help with navigation at longer distances Package included: DJI 420S ESC x 1 Made by DJI Innovation