Features: Brand new and high quality Step Down Power Supply Module DIY Kits Components Specifications: Dc input: 3-35V Ac input: 1-25V DC output:1.2-30V Maximum current: 3A Input and output the minimum differential pressure: 3V Maximum power consumption: 50W Color: blue Board size: 9.6cm*5.8cm Net weight: 146.6g Package content: 1Pcs PCB Board 1Pcs KF301-2 1Pcs Terminal(red and black) 2Pcs 1N4007 1Pcs KBL608 1Pcs 200ohm 1W resistor 1Pcs 4.7K ohm resistor 1Pcs 3MM blue LED 3pcs 104 capacitor 1Pcs 50V100UF capacitor 1Pcs 50V2200UF capacitor 1Pcs 50V4700UF capacitor 1Pcs 101 switch 1Pcs Potentiometer knob 1Pcs Potentiometer stents 2Pcs M3*6 screw 1Pcs 5K Potentiometer and the screw nut 1Pcs LM7812 1Pcs 338K Heat sink 1Pcs 12V fun 1Pcs LM338K 1Pcs 30V3A PPTC 4Pcs M3*50MM screw 20Pcs 3MM nut 4Pcs 20mm copper cylinder 4Pcs 4MM copper sheet 2Pcs 4MM nut 2Pcs 4*10 screw