Phoneix 75W DC-DC Step-down Converter Module W/ Digital Voltmeter current converter Input voltage: DC 4.0 ~ 38V. Output voltage: DC 1.25V ~ 36V continuously adjustable (the input voltage must be higher than the output voltage 1.5V). Output current: max 5A, recommended for use in the 4.5A. Output power: up to 75W, more than 50W, Please enhance heat dissipation. Voltmeter error:  0.05V.