This item is sold as KIT. SMD parts are soldered to PCB, THT parts have to be soldered by customer. All needed parts included in KIT.
Helps to learn how shift registers work, 16 led operated from 3 pins, can be daisy chained
Schematic can be found here: schematic REV A v02
Instruction, code can be found on Github: CMM2-ExpansionCard-ShiftRegisterLed