The three guarantees for earphone quality problems are: if the earphone fails within seven days from the date of sale, consumers can return it; If the performance is intentional within 15 days of sale, the consumer can exchange the goods; The warranty period is determined by the manufacturer.
 Legal basis
 Article 24 of the Law of the People's Republic of China on the Protection of the Rights and Interests of Consumers: If the goods or services provided by a business operator do not meet the quality requirements, the consumer may return the goods or require the business operator to perform the obligations of replacement or repair in accordance with the provisions of the state and the agreement of the parties. In the absence of State regulations and agreement between the parties, the consumer may return the goods within seven days from the date of receipt of the goods; If the conditions for legal termination of the contract are met seven days later, the consumer may return the goods in time. If the conditions for legal termination of the contract are not met, the consumer may require the operator to perform the obligations of replacement, repair, etc. Where the goods are returned, replaced or repaired in accordance with the provisions of the preceding paragraph, the business operator shall bear the necessary expenses such as transportation.