Onboard STM32 is Used to Generate High-Resolution PWM Signals for Precise Control; Support Manual Mode and Back to Center Mode, Switch By Key, with Mode Indicator; Each Servo Interface Has A Self-Recovery Fuse to Prevent Excessive Current Burnt Servo; Manual Mode Support Knob Adjustment Control; Power Supply Voltage Range: 5-9v (Specific to the Actual Servo Power Supply Voltage Shall Prevail); The Number of Control Channels: 8-Way; Can Be Directly Used 2S Lithium Battery Charging Head Debugging and Back to the Center Servo; Servo Control Accuracy: 0.09 Degrees (That Is, the Minimum Change in Pwm Value of 1 Us); Support for the Control Period of 20ms, Pulse Width in the 0.5-2.5ms Range of the Servo (Such As Futaba, , Etc.); Description: The Servo is A Power-Consuming Device and Consumes A Lot of Power, So the Power Supply Must Have Sufficient Current. If the Power Indicator Blinks, the Servo Rotation is Not Controlled, or the Error is Obvious, It Means That the Power Supply is Insufficient, and It is Necessary to Replace the Power Supply. 1. About Wiring Vcc, Gnd Connected to the Power Supply, the Servo Will Be Inserted in the 2x3p Row of Pins, Where Vcc is the Positive Pole, Gnd is the Negative Pole, S is the Signal Terminal. 2.Manual Mode Select Manual Mode Through the On-Board Button, At This Time the Manual Light is On, the Center Light is Off. Manual Mode Includes Knob Control 2.1 Knob Control: Directly Turn the Potentiometer to Control the Servo in the Range of 0-180. 3. Center Return Mode Select the Return to Center Mode Through the On-Board Button, Then the Manual Light Will Be Off and the Center Light Will Be On, and the Servo M0 and M1 Will Return to the Center At the Same Time. size: 100 x 55mm Material: PCB colour: As shown Package Contents: 1x Eight-Way Knob Servo Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.