DAOKI 5 PCS AC DC Power Supply Buck Converter Step Down Module 12v 5v 3.3v 9v The power supply for whole isolation type industrial-grade built-in power supply module temperature protection, over current protection and short circuit protection AC 85 ~ 265v wide voltage input, high and low voltage isolation 5v 700mA output voltage isolation, 431 voltage, output EMI filter circuit, with light, with mounting holes, high cost performance Use Environment:- Working temperature:-20 ~ 60- Relative humidity:40 ~ 90%RH