This module is a DC-DC step-up/step-down Converter Module. The module's output can be directly connected to batteries, power supplies, etc. Adjust the module's output voltage to the charging voltage according to the battery's voltage. Note: Before using this module, DO NOT connect any load and power it on. Use a multimeter to measure the output voltage, adjust the voltage potentiometer to the appropriate voltage value, and then connect the load! Input Voltage: 5V-35V (DC) Output Voltage: 5-28V (adjustable) Output Power: 150W (MAX) Output Current: Maximum 10A (depending on maximum power) Reverse Input Protection: Yes Reverse Output Protection: Yes (Ideal Diode) Color: Blue Material: PCB+Components Package Contents: 1 x DC-DC Converter Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.