Please use this application, when [ such ] there is no telling whether what I should do to like to use vibration. It can start easily [ always ]. Moreover, even if it closes an application, in the background, it can also vibration-starting-keep carried out and can use it also in the state of sleep. And strength can also be adjusted according to liking of it. since -- it can be made powerful if moved by necessity. Please use by massage etc.