A tool that allows you to call functions not only when the button is just pressed and released, as with a Unity Trigger - On Pointer, but also every time while the button is pressed.
It is enough to add a LongPressEventTrigger component and specify all the necessary events to trigger in it, as with a default unity button component, and everything will work.
But you can also specify how often events should be triggered when the button is pressed - tact paramter (The lower the value, the more often; the higher the value, the less often). Balance value is set by default.