Input voltage range438V (Note:input voltage not over 38V) Output voltage range1.25-36VDC adjustable.Output current: 0-5A,Output power: 75W High conversion efficiency up to 96% Updated Version: updated from LM2596 and better than it, with reverse voltage protection, over-temperature and short-circuit protection, thus making it much safer to use 100% SATISFICATION SERVICE: If there are any problem with our products, please feel free to contact us. you can request a refund for any single module and no need to return it.; Any problems you can contact us and we will try our best to resolve it till you satisfied.