ITEM NAME:10X LM2596S DC-DC Buck Converter Adjustable Power Supply Step Down Module EFW Descriptio n Material: ABS + metal Color: color Size: 43*21mm Input voltage: 3.2V-40V Output voltage: 1.25V-35V Output current: 3A (maximum) Transfer efficiency: 92% (maximum) Switching frequency: 65KHz Product List: 10PCS LM2596S DC-DC Step-Down Power Module Features: IN + input positive IN-enter negative OUT + output the positive OUT-output negative Normal Operation Tempretaure is 25℃ Note that the input and output can not be reversed. Reverse may burn out We offer you what you need! BI02867A1.Product List: 10PCS LM2596S DC-DC Step-Down Power Module. We'd like to settle any problem in a friendly manner. Note that the input and output can not be reversed. Reverse may burn out. Output current: 3A (maximum).