1. Reversal The Potentiometer 20 Times Before Testing! 2. Voltage Adjustment : Face The Potentiometer To The Chest, Turn Counterclockwise To Increase The Voltage! 3. The Module Output Voltage Cannot Be Adjusted And Is Always Equal To The Input Voltage. When You Encounter This Problem, Please Rotate The Potentiometer Counterclockwise For More Than 10 Turns, And Then Use The Module To Adjust The Voltage Normally. 4. After Using The Module, + And -2 ~ 24 V, The Output Voltage Can Be Adjusted By Adjusting The Potentiometer. The Output Voltage Is Higher Than The Input Voltage. 5. The Input Voltage Should Not Exceed The Maximum Input Voltage, And The Current Output Current Should Not Exceed 2A. Description: 1.Maximum Output Current: 2A 2.Input Voltage: 2V~ 24V 3.Maximum Output Voltage:more than the 5V-28V 4.Efficiency:more than the 93% color:As shown Material:PCB Package Contents: 10 X Boost Board 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.