Solu &reg; Lm2596 LED Voltage Regulator Dc Buck Adjustable Step Down Converter Module//lm2596 Dc-dc Voltage Regulator + Step Down Led Voltmeter Buck Converter Module// Dc Buck Step-down Converter Lm2596 Module Regulation with LED Voltmeter Display 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 Continuously adjustable output voltage range of 1.25V -37V, 4-40V input voltage range.The input voltage is at least high than the output voltage of 1.5V High efficiency,150 kHz fixed frequency internal oscillator. 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. Thermal shutdown and current limit protection.Guaranteed 3A output load current.