World power plug
2-pin plug: 2 pin plug name suggests is a plug has two blades or two pins, specific inserts or pins, each country is not the same standard, for example, China is the two blades, Europe is two round pins.
3-pin plug: 3-pin plug name suggests is a plug has three inserts or three pins or two blades or two pins plus a grounding hole. Such structure than 2 cores
Complicated power plug from the pin diameter size and what the requirements are quite standard, as well as the length between the pins are considered. Multi-pin plug: This multi-pin plug is more complex, what 4-pin plug, 5-pin plug or something, in accordance with the requirements of customers, the use of specific equipment on which should be considered according to the reality.