Where is the knob on the unmanned electromechanical adjustment?

There is no knob on the drone. Unmanned electromechanical control is an integrated component with no knob and wiring at both ends. Electronic control without knob is an important part of UAV, which is called electronic governor or ESC in English. Generally speaking, electronic control is brushless electronic control. The function of electronic control is to convert the pwm signal of receiver or flight control into output voltage and current intensity to control the motor speed.