Fulfillment by Amazon (FBA) is a service we offer sellers that lets them store their products in Amazon's fulfillment centers, and we directly pack, ship, and provide customer service for these products. Something we hope you'll especially enjoy: FBA items qualify for FREE Shipping and Amazon Prime.If you're a seller, Fulfillment by Amazon can help you grow your business. Learn more about the program. Switching power supply is a kind of energy electronic circuit product with high frequency switch, Which is often used as the power supply of equipment. Common power conversion modes include AC-DC. The switching power supply is characterized by high efficiency, small volume and high applicability based on the operating principle. Output current depends on the decive, such like 10A 120W, 20A 240W, 30A 360W,and the max current is 50A,power 600W.