The Denon AH-C751 is a pair of noise-isolating earphones featuring Denon's Acoustic Optimizer technology. A precursor to the advanced noise-reducing AH-C710 model, the AC-C751 instead relies on a machined aluminum housing designed to ensure neutral and balanced tonal responses, as well as balance internal sound pressure for optimum fidelity without coloration. As for comfort, the AC-C751 features three detachable ear pads (S/M/L) and dual Oxyen-Gree copper cables with equal cable lengths at the ear-pieces. Additional features of this model include large 11" diaphragms with Neodymium magnets (clarity bass), a compact carrying case (storage), and a specially designed plug that works with all major music players. The Denon AH-C751 retails for $199.99 and comes with a 1 year limited warranty.