Others feel slight discomfort with the unit above 1. However, over a period of time, usually 30 minutes or so, the sensation you consciously feel will fade into the background and should not be disruptive to daily activities. Without the gel, you will receive little more than localized skin stimulation. You should use a drop, about the size of a pea. The drop should be spread onto the skin, until a sheen remains, covering an area the size of a quarter, in the intended contact location.
Motion sickness is a progressive disorder.
This minimizes the time lag for application and activation, and also helps extend battery life. In all models, the flashing green light will turn red when approximately 4-6 hours of battery power remains. This type of battery does not self-deplete very quickly. The shelf life is specified as two to three years, under optimal storage conditions. Reactions are not severe.