This is a waterproof DC-DC converter. With 16-36V DC input, it converts to 9V 5A which is a good supply for robots. Features Overvoltage protection Overcurrent protection Overheat protection Short-circuit protection Waterproof and shockproof case High efficiency and less heat Specification Input Rage: 16-36V DC Output: 9V DC Output Current: 5A Size: 58 X 40.5 X 22mm(2.28×1.59×0.87\”) Efficiency: 96% Weight:0.09Kg Maximum working temperature:80 Shipping List 45W DC-DC Converter(FIT0169) x1