Solu &reg; Xl4015 4~38v to 1.25-36v 5a Dc-dc Adjustable Step-down Power Supply Module// 5a Xl4015 Dc-dc Step Down Adjustable Power Supply Module LED Lithium Charger//5a Dc-dc Adjustable Step-down Module Xl4015 4~38v 96% About us (Solu ), Professional factory of circuit boards for Arduino, welcome to our store for more choices with best price. What we pursue is your satisfication of our service, not just for our goods.For any reason you are unsatisfied with our product at any time, simply contact support for exchange or refund. we will reply you about any question you ask within 24 hours Input voltage range438VDC(Note:input voltage not exceeding 38V Output voltage range1.25-36VDC adjustable.Output current: 0-5A,Output power: 75W Usually, you will get it actually in 9~19 days, If you are in the USA and the item is NOT Fulfilled by Amazon. the item will be sent to you by USPS with shipping information from China. The estimated delivery time offered by Amazon is not the real time. Your patience is highly appreciated. Hope you will receive your item soon and enjoy using it. Input reverse polarity protection: None (if required, high current diode in series with the input).