This is a project box for a large 20 x 4 LCD display. The LCD module dimensions are 146mm x 62.5mm x 20mm (5.75” x 2.46” x 0.79”). The viewing area is 123mm x 43mm (4.86” x 1.69”). The character size is 9.65mm x 4.57mm (0.38” x 0.18”).
A 5mm x 7mm printed circuit board can be mounted inside which can hold an ESP32 or an ESP8266. Perforated board of this size can be found on EBAY or on Chinese E-commerce platforms.
You will need 4 M2 screws or equivalent screws to mount the LCD display. A few dabs of glue are required to mount the back cover onto the project box.