? Side tone holes, boosting double bass effect? Second-generation memory foam, offering top-level rebounding of 5 - 8 seconds and promoting the sound proofing by 8pct? Magnetic earphone design, attractive when near, available when apart and suitable for hanging when going out? In-line control, available for any tuning, particularly useful during playing games? A variety of accessories such as extended cable and PC converter and the like, flexible for free combination