Fostex TE04 Stereo Earphones are closed dynamic in-ear headphones featuring 8mm diaphragms driven by powerful neodymium magnets. They are engineered with a lightweight plastic housing that securely fits in the outer ear and can be used for listening to music on portable devices such as smartphones, tablets and laptops. Harmonically balanced, these headphones feature CCAW (Copper Clad Aluminum Wire) to reproduce rich lows and sharp mid-high frequencies. Two kinds of detachable cables are included -- one with in-line controller and microphone, and one with a length-adjustable cable with sliding clasp for a secure fit. Also included are four pairs of ear tips (XS, S, M, L) and a convenient carrying pouch. Founded in 1973, Fostex is an acclaimed manufacturer of location sound, multi-track recording, and speaker products.