This is a LEGO compatible brick designed to look similar to the smaller LEGO computer brick but sized to hold a .96" OLED (128X64 Pixels) which can be controlled through the I2C port of any microcontroller.
They are easily available online and also sold by Lectrify because they work well with the micro:bit and are easy to program with existing MakeCode blocks. Here's the link to purchase one through Lectrify: https://www.lectrify.it/products/oled
The author hasn't provided the model origin yet.