DROK 090586 DC-DC Waterproof Buck Converter 9-32V Step Down to 5V Voltage Regulator 10A 50W Power Supply Voltage Adopts synchronous rectification technology; high transfer efficiency of 90 percent; small heating generation Full-potting, waterproof, anti-shock, waterproof, moisture-proof and dust-proof Small size of 65x58x22mm; tiny in size and light in weight With overcurrent and short-circuit protection, hence safe to use