Sennheiser CX 985 Headphones Premium Sennheiser sound delivered by miniture dynamic transducers featuring powerful neodymium magnets Sophisticated design featuring metal alloy construction for improved durability Durable cable features a unique rotating 3.5mm metal plug and in line volume control 32-ohm impedance is ideal for use with portable media devices like MP3 players and "I" devices 2-Year Global Warranty