DROK 090601 Waterproof Auto Vehicle Voltage Reducer DC-DC Buck Converter 12V to 3.3V Step-down Voltage Regulator Transformer 3A/10W Power Supply Module for Car Radio LED Display DC-DC buck power converter for converting 12V to 3.3V with over 90% conversion efficiency. Input voltage must be greater of 6.3-22V than output voltage and make sure at least 3V voltage difference. Characterized by durable, anti-shock, anti-humidity, waterproof, dust-proof and over current protection. Synchronous rectification technology, higher operating efficiency, stable and reliable performance, low heat. Used in car audio, radio, LED screen, toy car, LCD TV, solar energy, electrical fan and etc.