1, B - 5 pin

This kind of interface can be said to be the most common kind of interface, this kind of interface is winning more and more manufacturers' attention because of its outstanding anti-misinsertion performance and relatively small size. Now this kind of interface is widely used in card readers, MP3, digital cameras and mobile hard disks.

2, B - 4 pin

This interface is common in the following brands of digital products: Olympus C series and E series, Kodak most digital cameras, Samsung MP3 products (such as Yepp), SONY DSC series, Compaq IPAQ series products.

There is also a Mini B 4Pin Flat. As the name suggests, this interface is flatter than the Mini B 4Pin and is more widely used in devices.

3, B - 8 pin

Compared with the previous common type, the original D-type joint is changed into a round joint, and a bulge is designed to prevent accidental insertion on the side.

This connector can be found on some Nikon digital cameras, especially the CoolPix series. While Nikon has always used this interface, newer models such as the D100 and CP2000 also use the most popular Mini B 5Pin interface.

4, B - 8 pin - 2 x 4

This interface is also a relatively common interface, such as iRiver's famous MP3 series, which is known as the "iron Triangle" 180TC, and many other products in the series use this interface. The range of application of this interface is also a wide range, but from the iRiver 3XX series to the Mini B type 5Pin interface, this specification is obviously not the Mini B type 5Pin eye-catching.

5, Micro USB

Complies with USB2.0 specifications and supports a data transfer rate of 12Mbit/s. The module will control pins according to the Microport interface for easy connection to the master controller that supports the Microport interface.

At the plenary session of ITU-T Study Group 5 (SG5) held in Geneva, Switzerland on October 26, 2009, the framework standard of "Power Adapters and Chargers for Universal Mobile Terminals and other ICT devices" was discussed and approved, and the application was submitted for approval. This effectively means a global standard for mobile phone chargers.

6, the Type - C

Type-c is a new form of USB interface that comes with the latest USB 3.1 standard. Released by USB-IF organization in August 2014, it is a new interface developed by USB standardization organization in order to solve the problems of USB interface with inconsistent physical interface specifications for a long time, and power can only be one-way transmission. It integrates charging, display, data transmission and other functions. The biggest feature of Type-C interface is that it supports two directions of insertion, which officially solves the worldwide problem of "USB can never be inserted".

The characteristics of Type-C hardware interface are obvious, mainly including the following:

(1) Support positive and negative symmetric plug and remove, to solve the problem of reverse plug cannot insert in practical application;

(2) Thin interface, can support thinner and thinner devices, portable devices can be designed thinner and smaller;

(3) Support more power transmission, up to 100 watts, support more high-power load equipment.

(4) Support single and double port Type-C, flexible application.

(5) Support bidirectional power transmission, both power transmission and receiving.