Hint: Installation requires some patience and practical skills. Beware of servo locked-rotor.servo working voltage: 6-8.4V (standard 7.2V), the servo black, red, white lines correspond to negative, positive and signal lines. 6 Way Button Steering Gear Controller: 1) Can control 6 steering gear 1 to 1, real-time synchronization 1:1 control. 2) No. 0, No. 1 and No. 2 of the control board have overcurrent protection to prevent excessive current from burning out the steering gear. 3) There is a small button under each button of the control panel. When you press it, the steering gear is in the medium state. The knob cannot control the rotation of the steering gear. Press again to remove the middle state, and the button can continue to control the steering gear. Size: 76mmx53mm Weight: 37g Wiring instructions: +: Connect to 5-8.4V power supply. -: Connects to the negative pole of the power supply. Generally, the steering gear control needs a few v, you can give the control board with a 5V. Type:Left Hand Colour:As Shown Material:Metal Package Contents: 1 * Robot Hand 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.