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Speakers are also called "horns". It is a very commonly used electro-acoustic transducer, which can be seen in sound-producing electronic and electrical equipment. A speaker is a transducer device that converts electrical signals into acoustic signals. The performance of the speaker has a great influence on the sound quality. The speaker is the weakest component in the audio equipment, and it is the most important component for the sound effect. There are many types of speakers, and they vary widely in price. Audio electrical energy produces sound through electromagnetic, piezoelectric or electrostatic effects that cause its cone or diaphragm to vibrate and resonate (resonate) with the surrounding air.

The biggest difference is:

International air transport is generally from airport to airport. The consignor must deliver the goods to the warehouse at the airport or other places designated by the carrier、 and the consignor must go through the export customs declaration formalities by itself (of course、 if you go to the extreme、 you may ask that you can entrust an agent to do it instead of delivering and customs declaration by yourself、 of course、 you can entrust an agent to do it、 but the cost must be borne by you、 the same principle) The customer shall also go through the import customs clearance procedures when picking up the goods;

However、 international express delivery is almost a door-to-door service、 that is、 after the express company receives the goods at the door、 it directly delivers the goods to the address specified in the waybill until the consignee signs for receipt、 which is considered to be the completion of the service. During this period、 the export customs declaration and import customs clearance at the port of destination are handled on behalf of the express company. Sometimes、 when there are many goods、 the import duties generated at the port of destination are paid on behalf of the express company、 and then collected from the consignee when dispatching.

The cost of air transportation mainly includes freight and miscellaneous charges. The unit price of freight is calculated according to the weight grade. Generally、 there are several grades:

+45kg

+100kg

(Goods above 100kg)+300kg、+500kg、+1000kg

Generally、 if there is no corresponding level of freight rate、 the freight of goods is calculated according to the tact price. The billing weight of goods is also important. The weight of goods is divided into volume weight and gross weight in air transportation. When the volume weight is greater than the gross weight、 the volume weight is the billing weight of the goods. When the volume weight is less than the gross weight、 the actual gross weight is the billing weight.

Miscellaneous charges include many aspects、 generally including storage costs、 fuel surcharges、 war risks、 etc

Fuel surcharges and war risks are products under specific circumstances. Generally、 the company's quotation is included in the freight.

International air express delivery costs are calculated in kilograms、 100 yuan per kilogram、 and 1 kilogram or less

It takes about 4-6 days to get to the United States from Shenzhen Air Express Line、 and then it takes about 3 days to get to Amazon warehouse in the United States. Generally、 it takes about 7-9 days.