A mini webserver, a nRF24L01 gateway to the MQTT broker, a wifi access control,a network data logger or a Philips hue emulator as in my case, and many, many more applications require a ESP 8266 / ESP32 without much further elements to run as standalone device 7/24. This case is made exactly for those devices. In form of a likely device it can be placed on the desktop. It might look a bit like a datacentre and due the dual print (transparent and black) and a led (or neo pixel) can build in for signalling or alarming propose. I use one of this to host the gateway to wifi of the nRF24L01 network and one to control the Philips Hue system. The case can host a Wemos mini (ESP8266) and a carrier for whatever is required: neoPixel, RF24, Zigbee receiver, …