Module Properties: non-isolated buck module (BUCK) synchronous rectification. Output current: 3A MAX. There is 1.5A fuse, output 5V have 300W TVS tube protect your USB device. Synchronous rectification, High efficiency, 6.5V to 5V 0.7A can up to 97.5%, 12V to 5V 1A can up to 94%.
eBay