• Adjustable mode: Choose between 2 different frequency modes according to your environment, ideal for any occasion. • High-quality earplugs: Made with soft silicone, they do not feel heavy even with prolonged use. • Long-term resistance: Up to 40 hours of continuous use with just 2 hours of charging. • Easy to operate: Adjust the mode and volume with a single button, manageable with one hand. • After-sales service: Contact us for any inquiries during use or purchase process. • Product dimensions: 0.1 cm wide, 0.1 cm high, 0.1 cm long. • Product weight: 0.16 kg.