Using high-precision CNC processing shell, mini and Reverse switch:Switch the control direction of the gyroscope. The correct switching should be made according to the direction of rotation of the main rotor of the helicopter and the direction of the tail rudder link. mode switch:Digital servo mode switch. When using the digital servo, please cut the mode switch to the ON position. When using the general servo, please cut it to the OFF position. If it is turned to the ON position, it may cause the servo to burn. (The output signal format is different) Control delay adjustment knob:Adjust the operating speed of the tail control signal. If you use a slower steering gear and find that the helicopter's tail rudder produce , turn the knob clockwise to increase the delay time to the phenomenon. If the tail rudder uses a high speed servo, such as a digital servo, adjust the knob to the 0 position. Steering gear maximum stroke adjustment knob:Set the maximum stroke amount of the tail rudder servo. Fully steer the rudder stick to the left and right. Adjust the knob so that the stroke of the tail rudder does not exceed the maximum range of the tail pitch sleeve. Turn the knob clockwise to increase the stroke. Connection:The sensitivity channel interface is connected to the receiver's sensitivity channel (usually CH5), which can be used simultaneously to switch the sensitivity and mode of the gyroscope (lock mode or general mode). Since the connector has only a single-core signal line, do not pull it hard to avoid disconnection. The rudder channel interface is connected to the rudder channel (CH4) of the receiver. The tail rudder servo interface is connected to the tail rudder servo. Function Instruction: For AVCS system: the AVCS system automatically eliminates the rudder offset caused by wind or other weather factors and various attitudes of the helicopter, making the rudder easy to handle, suitable for 3D fancy flight. For gyro sensor: the