These modules display the input in 2-digit hexadecimal value. One uses a tiny LCD available on AliExpress, the other uses a 7-segment HP 5082-7432 display.
By default, it displays bits from left to right as bits 7 to 0. Both displays can switch the bit order with 2 push buttons. Default is MSB, indicated by the LED on the left. LSB is set by pressing the push button at the right, lighting the corresponding LED.
The LCD module works only at 3.3V because of the limitation of the display. The LED modules works at 5V.
Jacques Pelletier