What's the difference between a usb model and a charging model?
Charging model and USB direct plug is not the same, the plug interface on the mobile phone is small, flat, the USB plug is larger, in a rectangular type, generally can see your mobile phone data cable (charging cable), a small head, is inserted into the mobile phone interface, a large head is the USB plug, is inserted into the charging seat, Or plug the interface (interface) and connector (or called connector, connecctor) on the USB interface of the computer. Different audio standards need to define their own hardware interface standards, hardware interface defines the physical characteristics of the connection between electrical devices, including the frequency and strength of the signal transmitted, as well as the type and number of the corresponding connection, but also includes the mechanical structure design of plugs and sockets. In short, the connector is the physical realization of the interface, the device that realizes the interconnection of the circuit.
USB charger is mainly to connect the mobile phone to the USB port of the computer, by the USB port to provide power, creative. The charger structure is very simple, there is no large transformer, the style and data line are the same, much lighter than the original charger, absolutely suitable for home travel, charging is necessary, the original can be thrown away. Now many MP3, mobile phones are equipped with USB charger, by the data cable as a power line, plug into the computer automatically start charging; At the same time, it is equipped with a transformer and the output is a USB interface, which can charge all electrical appliances for the standard jack: such as MP3 charger can charge mobile phones, which greatly facilitates people's life.
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Direct plug is directly connected to the socket to use, do not plug in the socket can not work, charging model has a rechargeable battery, fully charged can work without connecting to the socket, similar to mobile phones, electric vehicles, etc., more convenient.
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There is no difference between usb \"in-line\" and \"charging\