Input: DC 3.2V to 46V (The input voltage must be more than 1.5V higher than the output voltage. Can not boost);Output: DC 1.25V to 35V voltage continuously adjustable,output current is 2A;High Precision: 36 u thickening circuit boards, high-Q inductance with LED indicator output;Steps: Connect to power source, adjust the swirl button on the blue potentiometer and monitor voltage with multimeter to get the needed voltage,clockwise to step up voltage and counterclockwise to step down voltage. (Factory default stays a high voltage, you need to contrarotate about 7-8 circles before the voltage starts ramping down, 1 circle means +/- 1V);Note: This is a buck module. The input and output interface can not be reversed. The input voltage must be higher than the output voltage. A heat sink is required for working long time above 2A.Model: LM2596S DC-DC Buck ModuleInput voltage: 3.2V-46V (recommended for use within 40V)Output voltage: 1.25V-35VOutput current: max 3A (recommended for use within 2V)Conversion efficiency: 92% (highest)Output Ripple: 30mVSwitching frequency: 65KHzWorking temperature: -45C- +85CDescription: Input voltage range: DC 3.2V to 46V Recommended for use within 40V (The input voltage must be more than 1.5V higher than the output voltage. Can not boost).Output voltage range: DC 1.25V to 35V voltage continuously adjustable, high efficiency (maximum 92%) maximum output current is 3A, recommended for use within 2V. Measured 12V input, 5V output current 1A load regulation rate is less than 1%. High Precision: The buck converter consists of 36u thickened circuit boards, high-Q inductance with output LED indicator, and superior solid-state capacitors that can effectively filter out high frequency noise. Suitable for various electronic projects. With over-temperature and short-circuit protection, hence it is safe to use.Note: This is a buck module. The input voltage must be higher than the output voltage.The input and output interface can not be reversed. A heat sink is required for working long time above 2A.size:4.3 x 2.1 x 1.4cmMaterial:ABScolour:As shownPackage Contents:10 x Converter Step Down ModuleOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.