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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.

According to the form and packaging of goods、 the maritime transport goods are divided into three categories: liquid goods、 dry bulk goods and general cargo. The three categories of goods are divided as follows:

① Liquid cargo: petroleum、 product oil、 liquefied gas、 liquid chemicals and other liquid cargo.

② Dry bulk cargo: various primary products and raw materials. Generally、 dry bulk cargo can be divided into bulk cargo and small bulk cargo according to the size of transportation batch. Bulk cargo mainly includes coal、 metal ore、 grain、 etc; Small batch bulk cargo includes steel、 wood、 fertilizer、 cement、 etc.

③ General cargo: mainly including electromechanical equipment、 chemical industry、 light industry medicine and other industrial finished products、 agricultural、 animal husbandry and fishery products. These goods are generally consigned in the form of "pieces"、 "boxes" and "bundles"、 including packaged goods、 unpacked goods or non packaged goods、 and unitized goods.

FBA headline by sea voyage is cheaper、 but it is relatively slow and cost-effective for large cargoes.

However、 if it is a small package、 air transportation may be more cost-effective and efficient.

The specific requirements shall be selected according to the products you transport and the time limit、 which is the most cost-effective

1. You need to first determine whether the items you send can be sent、 whether they are ordinary goods or special sensitive goods such as electrified and liquid goods、 ordinary goods and sensitive goods can be sent、 and prohibited goods are not allowed to be sent.

2. It is better to seal the packaging、 vulnerable and leaky articles before delivery、 add foam bags and other appropriate protection to prevent the goods from being damaged. The price of international express is calculated according to weight and volume weight. Reasonable space arrangement and volume control can save a lot of freight.

3. If the recipient's information is not detailed or incorrect、 it will cause the express delivery to be unable to deliver the goods to the recipient accurately and timely、 or even cause the goods to be sent wrongly. Be sure to check carefully and make no mistakes. Note: The address of domestic express delivery shall be filled in Chinese、 while that of international express delivery shall be filled in English.

4. Tariff and tariff are determined based on the type of goods、 the quantity and value of goods and the customs policy of the destination country. The probability of levying tariffs on normal personal goods is very small. Generally、 the declared value of your goods does not exceed the tariff threshold of the passing national customs、 and there is no need to pay tariffs.

5. Customs clearance. If the sensitive goods or articles are too high in value and need to pay customs duties、 the freight forwarding company will send the materials required for customs clearance to the recipient. The recipient needs to provide documents and goods information in accordance with the format. After customs quarantine、 review and inspection are completed、 the recipient can release and continue to deliver after paying customs duties. If the goods themselves are defective、 they may be detained and destroyed.