1Voltage Specification: Input voltage range from DC18?40V, output voltage is DC13.8V(non adjustable), Med for 25A, Mxa is 40A 2High Conversion Efficiency: Synchronization rectification technology, with multiple intelligent protection function with high conversion efficiency and stability. The conversion efficiency may reach 95% 3Protection Function: Support over load, over current, over temperature, short circuit, over voltage protections 4Aluminum Shell And Silicone Sealed Design: Waterproof, non shock, prevent humidity and dust proof, more durable 5Wide Application: Suitable for boatgolf cart, Rv device, large trucks, taxi radio, Emu, car audio, Lcd Tv, advertising screen, LED strip lights, monitoring system, electronic systems and Diy, etc.