This product comes as default: "on" to "off" mode. In short, when you click it "on" via the app it will turn on and then off immediately.
To enable the device to be one click = "on", next click = off, hold the mode mode (this is the button closest to the edge) until it is continuously illuminated. When "on" two red lights will be on. When "off" only the light near the mode button will be on.
Google home users. You can link this device/account to the ewelink app. Google home sees this app as "Smart We Link" not ewelink.