1 Piece Positive Voltage Regulator PCB, for LM317 or L78xx series(7805 7808 7812 etc) Regulator IC. FR-4 Fiber glass PCB. PCB Size: 50 x 50mm / 1.97 x 1.97 inch PCB Thickness : 1.6mm / 0.063 inch Datasheet: https://www.czh-labs.com/tmp/madeimg/datasheet/pcb-a230.pdf This item is one piece PCB, does not include other components, if you want to buy module or related components, please visit my shop.