5A 75W large power, in addition to the function of current limit, voltage stabilizing and step-down, the module can also be used as a high power LED constant current driver module and charging module for the lithium battery of usb connector.Two kinds of work mode: constant voltage and constant current. The red indicator light can show the current working status. Light up means constant voltage mode, light off means constant current mode.With current limit, short circuit, over temperature protection, the module can not be burned out even if the output is short circuit, which is more safe. Please dont reverse connection at the input port, otherwise the module will be burned out.Used as a charging module for lithium battery, blue light up means charging, blue light off and green light up means charging completed.Owning two high precision voltage and current pontentiometers, rotate the screw to adjust output voltage and current.How to set the current and voltage: 1. Adjust the constant-voltage potentiometer, make sure the output voltage to achieve what you need. 2. Directly connect the multimeter to the output ports at 10A current, to measure the output short circuit current, and adjust constant current pontentionmeter to make sure the output current to achieve the scheduled value.Length: 61mmWidth: 26mmHeight: 15mmWeight: 50gInput Voltage: 4V-38V(38V is max)Output Voltage: 1.25V-36V ( Used as a module, the input voltage be higher than output voltage more than 2V. )Output Current: 5A (MAX), the output voltage can only be adjusted when the voltage is above 2V.Output Power: 75W (MAX, Please strengthen the cooling when the output is above 3A 35W.)Work Temperature: -45 to +85 degree centigradeSwitching Frequency: 180KHzTransfer Efficiency: less than or equal to 96%Short-circuit Protection: Yes (Limited current 8A)Over-temperature Protection: Yes (Automatically shut off the output once over temperature)Reverse Voltage Protection: NO ( Please note positive and negative electrode, or it will burn out directly. If need, please add large current tube.)Connection Mode: Terminals or solder terminals. V-IN for input, V-OUT for output.color: bluematerial: plasticPackage Contents:2 x step-down power converterOnly 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.