KZ ZS1 Dual Driver Extra Bass Wide Sound Field Sport In-Ear Monitors Headphones Independent sound channel for each driver, the sound will not be distorted Excellent sound quality with vast sound field, for magnificent spatial aspects of the sound Dual driver speakers, complement each other; bass, mids and treble is rich and energetic Gold-plated jack, HiFi lossless cable, sound connection to your audio device With memory wire, easier to keep moving with headphones