Spider E-HEPH-WH01 PowerForce Headphones White Designed for audiophiles by audiophiles 40mm dynamic driver, 10 - 22K Hz frequency response reproduces the lowest lows and highest highs Multi-directional design allows single-ear, studio listening, Super-soft ear cushions feel comfortable even after hours of wearing, Premium memory foam helps to block outside noise. Cable lock function makes sure the music does not stop while you are active, feet and 4 feet cables included Rugged yet lightweight, Easily folds into supplied storage bag, Professional grade quarter-inch adaptor included.