SMAKN DC 7-40V to 1.25-36V DC to DC Converter Buck Power Supply Regulator LED Driver DC to DC 8A high current buck power supply with constant current, constant voltage function. can be use as dc power supply, solar battery charger, Lithium Battery charger, with turn light indicator. can be use as high power LED driver module. Module Properties: non-isolated step-down module (BUCK) Input Voltage: DC 7-40V Output voltage: DC 1.25-36V continuously adjustable Output current range: 0.05-8A (the default output current is 1A) Turn light current: constant current value * (0.1),such as the constant current value is 3A, Turn light current is set to constant current of 0.1 times (0.1 * 3A = 0.3A), when adjusted constant current value to 2A, then Turn light current is constant current of 0.1 times (0.1 * 2A = 0.2A). this version is 0.1 times fixed