the output state of a pulse wave optimum to the user and applied to the head of the user is automatically set while improving the wearability of the electrodes , and different output states of pulse waves can be simultaneously applied to a large number of users . a pulse wave of predetermined pattern is given to the skin near an ear of the user and / or of the back of a hand of the user to directly stimulate and activate the brain . this stimulation is significantly effective especially for colorblindness . by systematizing such a revolutionary therapy , pulse waves of different patterns can be applied to a large number of patients , enabling a quick , effective therapy .