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 storage 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 lighted when the module is in constant status. Blue lighted when the module is charging. Green lighted 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 , module. Input a constant voltage (such as mobile phone charger or storage 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 cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.