There is no doubt that Merryking Electronics 5V 2W 500mW USB Power Adapter is a quality product. Quality starts with the selection of high end materials to manufacture the product and the implementation of the latest technologies. high standards in product manufacturing at his own factory in Bao An District, Shenzhen and strict quality control. Every product is guaranteed to be tested 100% of the time before it is shipped to ensure it functions. The certification that all of Merryking Electronics products comply with global standards. The USB Power Adapter will help increase the functionality of all your devices. A warranty is provided, along with the quality assurance from Cityronics that your devices will function at peak performance.