1. 4.4mm is suitable for players such as Sony, and the 3.5mm socket is used for mobile phones, computers, ipads, etc. If you have any questions, please consult customer service. 2.5mm is for players with 2.5mm balanced port output such as Avery 2. The wire is single crystal copper silver-plated core wire + TPE middle layer + nylon braided outer layer (wear-resistant and tensile, reducing auscultation effect) 3. Use optimized wire core structure to obtain excellent performance signal transmission, and maximize the potential of the earphone 4. The resolution is improved, the sound is transparent and smooth, and the details are clear and layered; the middle frequency is moist and the vocals are magnetic; the low frequency is full and powerful 5. Applicable models: suitable for Sony MDR-Z7 / Z1R / Z7M2 and other headphones 6. Wire material: copper 7. Wire core material: silver-plated copper wire 8. Process: silver plating 9. Length: 1.2m
