@ ran Q: The sound quality of the headphone Is not good? A: For al of the headphone products, they need a period of use to get better sound ‘quit. Borne component, auk as diaphragm unit, transistors, integrated circuits, and capacitance, and can bo stabilized tare & period of use. Q: Why cannot synchronizes the vole? A: Our products are mainly compatible with I Phone, Samsung, and chert mainstream mobile phones, Dus to too many Android instar, our dastard cannot match all types of Android systems.