Many hypnotists lay claim to state of the art technology. Be wary of such enticements.  They are calculated business maneuvers to draw the uninformed client.  The only technology an experienced and talented hypnotist requires is the human voice.  Period.  All the rest is slick window dressing.  We can use music, employ reverb, follow your biorhythms, and boggle your vision with optical tools.  But.  Only the human voice is needed to induce trance.  It is the human voice, mind and spirit which will guide you in changing oppressive thought and behavior patterns in order to create health and happiness in your life.