voltage converter input voltage range is DC 5-30V, output voltage range is DC 0.5-30V, output current of natural cooling is 3A, with strength sinking output current can reach 4A. Automatically Boost or : no matter the input voltage is higher than 12V or lower than 12V, the voltage can be steadily output 12V. Constant Current: input any value within DC 5-30V, can directly charge battery, lithium battery, AA battery; besides, it can adjust LED brightness of constant The higher multitier potentiometer is used for adjusting the output voltage; the shorter one-loop potentiometer is used for adjusting constant current value. If you need to increase voltage /current, please adjust the corresponding potentiometers clockwise, whereas counter-clockwise adjustment. Setting Value of Constant Current without Multimeter: using one-loop potentiometer with scale to set the constant current value will be more easy. MOS-input anti reverse protective, under-voltage shutdown protection, output over-current protection. Output voltage: DC 0.5~30V Output current: 3A (Long-term stability work); 4A (strength sinking can reach) Output : 35W (naturally sinking); 60W (strength sinking). Switch efficiency: Boost voltage 88~91%; voltage 87~90%(It will be changed according to voltage difference and load) Working frequency: 180KHZ The factory output voltage defaults 12V, constant current defaults 2A Turn lights in full-charge:Red when the module is in constant status. Blue when the module is charging. Green when the charging current is less than one-tenth constant current value you set, charging is finished. Very suitable for the device of input voltage range and constant output voltage, such as constant voltage battery, solar generation, module. Input a constant voltage (such as mobile phone charger or battery charging) can get DC 0.5~30V adjustable power. Constant Current besides, it can adjust LED brightness of constant current Colour:blue Material:plastic size:68 * 29 * 21mm Package Contents: 1x Auto Boost Conveter 60W Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.