TP-Link Tapo S200B Smart 868 MHz Button, CR2032 batterySmart Actions - Control and set multiple lights, electronics, and other Tapo smart devices with the button.Customized Actions - Single tap, double tap, and rotating options enable you to trigger multiple actions, from just one button.One-Click Alarm - Family members can use the device to get help in times of need.Control From Multiple Locations - Control electrical fixtures from multiple locations with Tapo smart buttons.Long Battery Life - The battery will last more than one year.