1. Convenient for watching movie, enjoying the drama, attending meeting, or having class, it could help you hear the sound clearly and loudly 2. Super mini size and light weight, not easily to be seen 3. With volume control 4. 3 different size earplugs can fit most of people''s ears 5. A storage box is provided to organize its components, convenient to carry 6. Adjust volume to the minimum before wearing 7. Increase volume gradually to avoid sudden increase in sound 8. Button battery not included
