TOOGOO(R) New 10Pcs DC-DC LM2596 Converter Buck Adjustable Step Down Power Module 1.5-35V With this module ,you can adjust the potentiometer of your car, the output voltage can be adjusted in 1.25-30V, for your MP3,MP4,PSP charging many devices powered, very simple and convenient . If the electronic equipment needs 3-35V power supply voltage,you can get the specific voltage with it. System voltage testing, a project can use this module debugging a variety of voltage test system operating voltage range , very easy and convenient .