XIANQI Dimension : 76mm*53mm(2.99in*2.09in); Weight: 37g (1.31oz) Use high-precision six potentiometers, which can control the corresponding six servos simultaneously The 0th, 1st, 2nd and 3rd interface have over-current protection to avoid burning out servo due to over-current The voltage that the controller require should correspond to the voltage required by a servo that you controlled There is a small button under each knob of controller, press it, the servo will return to the center of the state, the knob can not control the servo rotation; then press it, remove the center of the state, the knob can continue to control the servo rotation Parameter: Dimension : 76mm*53mm(2.99in*2.09in) Weight: 37g (1.31oz) Wiring Instruction +: connect 5-8.4v power supply connect the power supply negative The voltage that the tester require should correspond to the voltage required by a servo that you controlled