Smart devices are everywhere. Smart phone, smart refrigerator or smart door etc. This small device is a smart Plug. It is smart because it is a smart Wi-Fi Plug with energy monitoring. You can control devices anywhere and believe me, no hub is required. Kasa Smart Wi-fi Plug also works with Alexa for voice control (which is sold separately of course). You can do many things like toggle the power for coffee makers, curling irons, lights and also you can schedule it while you are on vacation or at work by using your smart phone only.
The good thing about this smart plug is it monitors your daily energy usage as well. This model is the only one which is below $20 in the market.