ITEM NAME:Digital Servo Tester Servo Controller Voltage Display Description: Wiring method: 1. 7.4V lithium battery charging terminal can be directly inserted in the white terminal; 2. Connect the power supply to the blue terminal \, the positive voltage can be 5~8.4V. Width*Length: 35*50mm Weight: 13.8g Specification: Usage method: 1.Connect the power supply to the board; 2.Connect the servo to the servo interface. + is positive\, - is negative\, S is the signal terminal; 3.Turning the knob\, the servo will rotate synchronously; 4.There is an elastic button under the knob which can switch mode; "Back to" is: back to the middle position; "Manual" is: knob control. Package Includes: 1 Piece Servo Tester.Connect the servo to the servo interface. 1 Piece Servo Tester. Turning the knob\, the servo will rotate synchronously;. There is an elastic button under the knob which can switch mode;. "Back to" is: back to the middle position;.