It is an application exclusively for Iso button of Nazca · Dash. We will send e-mail to the e-mail address registered in advance on the service server. By saving time and effort of sending mail, it can be used in a variety of ways, such as ordering buttons, notification buttons, watching buttons. https://www.from.co.jp/service/service_mail.html * It is an application to be used in conjunction with the IoT button. It will not work with applications only.