Descriptions: The module uses the step-up and down the chip as the main controller, external 60V 75A MOS tube as a switch, double 60V 5A SS56 Schottky do rectifier. Can be boosted, the output voltage 0.5-30V arbitrary adjustment, limiting current 0 -4A arbitrary adjustment; can be used for LED constant current drive, battery charging and other constant current occasions, while limiting current with overcurrent for protection, more secure ; Constant current mode indicator, charging indicator, full of light. Output anti-backwash, do not charge the battery when the additional anti-flooding diode. Wide voltage input 5.5-30V, wide voltage output 0.5-30V, such as you adjust the output voltage of 18V, then the input voltage between 5.5-30V casually change, will be constant output 18V; then for example, you enter 12V, adjust the potentiometer settings 0.5-30V arbitrary output. Specifications: Input Voltage: 5-30V Output Voltage: 0.5-30V Output Current: to long-term stability in the 3A, to strengthen the heat can reach 4A Output Power: Natural Cooling 35W, Strengthen the Heat 60W Conversion efficiency: 88% Short circuit protection: Yes Operating frequency: 180KHZ Size: 65x32x21mm/2.56x1.26x0.83"(LxWxH) Quantity: 1 Pc Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! No Retail Package Package Contents: 1 x Step Up/Down Module