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The ESC Center Board and MC for Phantom 3 Professional and Advanced from DJI is a single PCB the integrates the MC and four ESCs. The MC (Main Controller) is the heart of the flight control system: a mini-computer that maintains flight stability based on sensor feedback and navigational data. The ESCs (Electronic Speed Controllers) sit between the MC and each motor, regulating the power sent to the motor as well as relaying feedback from the motors to the MC.