This is a DC-DC buck converter module that can convert 3.2V-35V to 1.25V-35V with a maximum current of 3a. The step-down converter module is used to reduce the voltage. Therefore, make sure that the input voltage is at least 1.5 V higher than the output voltage. The efficiency of the step-down module is very high, which is useful for the pull-down voltage. It is recommended that the current be below 2.5A for long periods of time. If it is greater than 2A (power more than 10 W), the heat dissipation will be changed. The DC-DC module converter is widely used in the low voltage system supply, 6V, 12V, 14V, 24V battery charging and regulated power supply. Type: power module Model: LM2596 Step-Down Module Input voltage: 4V-35V Output voltage: 1.23 V - 30 V. Output current: 3A (maximum) Conversion efficiency: 92% (maximum) Output ripple: less than 30 mV Switching frequency: 150kHz Working temperature: -45 Celsius + 85 Power supply (3-40 V), the power indicator lights up and the module works normally. Adjust the blue potentiometer knob (usually clockwise to improve, counterclockwise to rotate down) and use a general expression to monitor the voltage required for the output voltage. Caution: As this is a step-down module, it is recommended to work for a long time with a current of less than 2.5 A and to add a heat sink (output power greater than 10 W). Maintain the minimum difference of 1.5V to ensure stable performance. Colour blue Material: printed circuit board Size: 4.3 x 2.1 x 1.4 cm Package Contents: 4 x Buck converter Only the above package content, other products are not included. Note: Light reflection 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.