Application: This module can be applied to applications where the input voltage is higher than the required output voltage, such as battery-powered systems, power adapters, DIY adjustable power supplies, automotive equipment, and industrial power systems. Examples include stepping down 24V to 12V, 12V to 3.3V, 12V to 5V, 24V to 5V, 24V to 12V, 36V to 24V, and similar voltage conversions. Name: LM2596ADJ DC-DC Step-down Power Module (Step Down Adjustable with Digital Display) Features: Equipped with a digital voltage meter that supports self-calibration. Utilizes an advanced microprocessor for accurate voltage readings with an error margin of 0.05V, measuring range 040V. (To ensure accurate readings, input voltage should be 4.5V or higher.) One-touch button to switch between input and output voltage display, with indicator light showing the active measurement. Saves settings even after power cycle. Input Voltage: 4.540V. (Input voltage must be at least 1.5V higher than the desired output voltage.) Adjustable Output Voltage: Continuously adjustable from 1.25V to 37V. (Input voltage must exceed output voltage by at least 1.5V.) Output Current: Up to 3A; recommended for use within 2.0A. For higher currents, additional heat dissipation is required. Output Power: Up to 20W; for loads above 15W, enhanced heat dissipation is recommended. High conversion efficiency, averaging 88% (efficiency varies based on input/output voltage and load current). Includes reverse polarity protection; the module will not be damaged if connected with reverse polarity. Color: Blue Material: ABS Package Contents: 1 x Voltage Regulator Note: The package includes only the items listed above. Other accessories are not included. Note: Lighting and display differences may cause slight variations between the product color in images and the actual product. Measurement error allowance: 13 cm.