This is a mini DC-DC buck converter step-down power modulewith size of 22x17x4mm,capable of driving a load up to 3A with high efficiency, which can work with Iteaduino UNO, other mainboards and basic modules. It can also be used in DIY portable power, monitor power supply, buggy power, camera power supply, car power, communications equipment supply and other applications demanding for size and weight (such as aviation models, etc.).