USB supports Huawei 5A high current interface with a raised 11.3mm fast charging connector. In order to facilitate charging at home, work, and other fixed locations at any time, we often equip ourselves with a separate charger and data cable. However, we need to choose a fast charging charger based on the fast charging standards supported by the phone or electrical interface, such as Qualcomm QC solution, Huawei FCP or SFCP solution, OPPO VOOC flash charging solution, and so on. The problem of insufficient power supply for USB has always been accompanied by the development of USB. Similar incidents have occurred frequently, but the issue of insufficient USB power supply has not been effectively resolved, bringing many troubles to users, especially for some entry-level users and computer laymen, the situation cannot be ignored. What is the reason for the insufficient power supply? We will mainly test the charging of some commonly used USB2.0 devices on the surface, so that more friends can understand the current power supply situation of mainstream USB2.0 devices in the market. USB is the abbreviation for Universal Serial Bus. Today, with the popularization of computers, USB devices are ubiquitous in our daily lives. USB supports Huawei 5A high current interface, which is one of the most widely used interface specifications. The USB interface specification has also undergone several upgrades and improvements in its development process, from the initial USB 1.0 to USB 1.1, to the current mainstream USB 2.0 specification, and even to the recently introduced USB 3.0. Huawei's charging heads can successfully shake hands on phones that support Quick Charge 2.0/3.0 to achieve fast charging. Fast charging phones can quickly charge MP3, MP4, digital cameras, mice, keyboards, automotive components, digital audio systems, household appliances, office equipment, measuring instruments, and industrial control equipment, all of which can meet the fast charging standards,