Usage: This module can be used in areas where the input voltage is higher than the step-down output voltage, such as batteries, power supplies, DIY adjustable power supplies, 24V car T in the power equipment industry, 12V switch 3.3V, 12V switch 5V, 24V switch 5V, 24V switch 12V, 36V 24V turn and so on. Name: LM2596ADJ DC - DC Step-down Current Module (Adjustable with Digital Display S With a voltage meter and voltmeter display self-calibration. Uses a more advanced microprocessor voltage voltmeter error 0.05V, Range 0 ~ 40V. (For accuracy voltmeter, make the input voltage 4.5V and higher) Press one button to switch between input or output voltage measurements and has a light indicator showing which voltages are being measured, and saves your settings, even if the power is turned off and then turned on. Input Voltage 4.5~ 40V. (Input voltage must be higher than output voltage by 1.5v or more) Adjustable output voltage range of 1.25V ~ 37V continuously adjustable. (Input voltage must be higher than output voltage by 1.5V) Output current 3A, recommendations within 2.0A use, high current required to improve heat dissipation. Output power 20W, 15W, improve heat dissipation above. High conversion efficiency, on average 88% (efficiency and input and output voltage, current, pressure related) With reverse polarity protection, reverse polarity will not burn Color: blue Material: ABS Package Contents: 1 x Voltage Regulator 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 to be a little different from the real thing. The measurement allowed error is +/- 1-3cm.