Before revision:  The robotic arm is made up of three modules: The arm, the arduino microcontroller, and the voice module. The arm contains three rotary joints and an end effector, where the rotary motion is provided using the servomotor. Moreover, the robot can be operated in two modes, manually using potentiometer shafts and automatically using instructions. Arduino is programmed in such a way that selecting one mode will disable the other .
After revision:  The robotic arm is made up of three modules: the manipulator, the voice recognition module and the microcontroller. The robotic arm is programmed to orient to the direction where the signal to noise ratio is maximum .