Today, SONOFF introduces a USB smart adaptor with 5V input and output that makes your USB devices smart as well as provides convenience and security when you charge USB devices. Connect your USB devices with it and you will control the connected USB devices via eWeLink APP or Alexa and Google Home. The small size as your ordinary USB power adaptor, easy for you to take it anywhere around the world to charge. This can also be used to make your USB powered appliances smart as you can turn them on and off fro. your fingrtips.