Fangrui Product Details Application:this Module Can Be Applied To Fields In The Input Voltage Is Higher Than The Step-down Output Voltage, Such As Batteries, Power Formers, Diy Adjustable Power Supply, 24v Car T Of The Power Equipment Industry Buck, 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 Power Module ( Step Down Adjustable With Digital Display S With A Voltage Meter And Voltmeter Displays Self-calibration. Uses A More Advanced Microprocessor Voltage Voltmeter Error 0.05v, Range 0 ~ 40v. (to Ensure Accuracy Voltmeter, Make Sure The Input Voltage Of 4.5v And Above) Touch Of A Button To Switch The Input Or Output Voltage Measurements And Has A Light Show Which Is Being Measured Voltages, And Save The Settings, Even The Power Off And Then On. Input Voltage 4.5~ 40v. (input Voltage Must Be Higher Than The Output Voltage Of 1.5v Or More) Adjustable Output Voltage Range Of 1.25v ~ 37v Continuously Adjustable. (input Voltage Must Be Higher Than The Ou