It is a vibrator massagerIt is not for pain reliefIt is for stress relief from daily workif someone use it in front side one can apply by his and otherwise to use in backside someone needs a person helpit is not for the soft parts of our bodies like eyes and some another normal skin partsNot should be in the range of childrenuseful for the muscles that attracts tight or unmovable in winter days it gives relief by making muscles move slider with gap with another muscles