These Sennheiser CX 985 earbud headphones that feature noise isolation to reduce background sound, so you can listen to your music at a safe volume. The metal alloy housing offers a durable design for on-the-go use. The new Sennheiser earphones are a perfect combination of top-quality sound and sophisticated design,” explained Rajender Mogili, Product Manager at Sennheiser Consumer Electronics. “They deliver sound to the renowned Sennheiser quality standards. High-performance dynamic transducers produce a true-to-nature sound with a highly detailed resolution.” To make sure that the headphones are ready for use at any time, they have been fitted with a 3.5mm stereo jack, and the nominal impedance has been reduced for optimum connection to mobile players.