KOSS Pathfinderk Pathfinder In-Ear Headphones with Volume Control. Enhanced isolation decreases ambient noise. In?\line volume control. Dynamic element positioned outside ear connects to tubular port structure. Slow memory ear cushion made of hydrophilic, formed urethane for custom fit. Soft memory foam ear cushions create the perfect custom fit & enhance bass and treble clarity. Freq resp: 10 Hz??20 kHz. Imp: 16??. Sensitivity 112 dB. 3.5mm plug. 4-ft cord. Black.