12mm Drivers, Extra Bass Design, In-Line Mic & Remote, Sony Smart Key App Compatible, Customized Android Control; Cord Length: 3.94 ft; Frequency Response: 4-24,000Hz, 4–24,000Hz; Cord Type: Y type, flat cord. Removing the headphones: After use, remove the headphones slowly. Note: Headphones are designed to fit closely in your ears. If the headphones are pressed hard while in use or taken off too quickly, they may cause injury. Wearing headphones may produce a diaphragm click sound. This is not a malfunction. If you connect to an unsupported smartphone, the microphone of this unit may not function, or the volume level may be low. This unit is not guaranteed to operate digital music players.