The DC buck converter, waterproof, overvoltage and overcurrent, input voltage range DC12V/24V (wide voltage 10V-35V), output voltage DC 5V, conversion efficiency above 96%, heat is very low, it used to:Bus, CMB, large trucks, motor car, solar power, bus displays, taxi advertising screen, no interference taxi radios, car audio, LCD TVs, LED, intercom and monitoring systems.