Types and parameters of USB cables The USB interface is classified by: Standard, or connector form: Type-A and Type-B, Type-C. Port A is used to connect mice and flash drives. The profile of connector B depends on the device it is intended for. A standard cable has connector A at one end and B at the other. Type-C is symmetrical and thin. Due to this, it is placed on the sides of the body of ultra-thin devices. Size: standard, mini, micro USB cable. These types are implemented in Type-A and Type-B connectors. The size of port C is comparable to micro-B. Length: the longer it is, the more the signal fades and its speed drops. It is better to buy adapters up to 3 m. Typically, cords in the mini and micro usb categories differ in the following characteristics, on which the price depends: length; the presence of a ferrite ring - a filter for protection against high-frequency interference; shielding – protecting electromagnetic waves from external fields.