Understanding the AWM 2725 VW-1 80C 30V USB Cable If you have ever looked closely at the small, grey, or black text printed on a USB cable, you might have seen a string of characters like Contrary to popular belief, this is not a specific model number or a request for a "driver" in the traditional software sense. Instead, these markings are Underwriters Laboratories (UL) safety and manufacturing specifications that describe the physical and electrical limits of the cable's internal wiring. What the Specifications Mean

This indicates the cable is a UL-recognized component intended for use in appliances and electronic equipment.

This is a flame-retardant rating. It means the cable has passed a vertical flame test and will not easily propagate fire.

Each part of that string tells you something specific about how the cable was built and what it can handle safely: