I am a newbee so my questions will be uninformed. I would like to use Alexa or Google home to trigger a 4.5V relay that is self locking. some of the Sonoff products seem to be able to do what I need but I am not sure how to integrate the Alexa unit with the Sonoff device and eWelink. I saw a Sonoff device that runs on 5V and has a wiring option to shut off output power after 1 second. This seems perfect for my self-locking relay. Any advice would be appreciated. Sonoff device is RE5V1C