First, when a voice becomes a registered trademark, it must be strictly in accordance with the law, and the prohibition clauses stipulated in the trademark law, such as military songs and national anthems, cannot be abused.

Second, the sound should be distinctive and unique, which will trigger the customer's association with the goods at the first time, which is what people usually call conditional emission;

Third, sound becomes a registered trademark, which is different from the application principle of traditional trademarks such as words and graphics. As long as it is not a place name or uncivilized language prohibited by law and has not been registered by others, it can be registered as a trademark. Sound trademark is a sound with specific directivity that is well known to the public.