Definitions for "Momentary"
Done in a moment; continuing only a moment; lasting a very short time; as, a momentary pang.
lasting for a markedly brief time; "a fleeting glance"; "fugitive hours"; "rapid momentaneous association of things that meet and pass"; "a momentary glimpse"
Stimulation that lasts only a brief time, far less than a second, no matter how long the button is pressed . It has an attention getting effect.