Quad Hi-Definition MicroDrivers: For extended high-end clarity and unparalleled low-end performance Patent-Pending Earphone Design with Groundbreaking Low-Pass Filter: Provides previously unattainable deep low-end performance of a True Subwoofer without sacrificing clarity or detail Customizable Frequency Response: Adjustable sound signatures available (including balanced, warm or bright) via changeable nozzle inserts and removable, metal nozzle Sound Isolating Design: Prevents outside noise from interfering with your audio experience, whether on-the-stage or on-the-go Unmatched Personalization & Comfort: Detachable cable with wireform fit allows for easy replacement and customization and provides a secure fit