The Sennheiser CX 300S Headphones offer beautifully detailed audio to bring your favourite music to life. Boost your sound thanks to Sennheiser's transducer technology for a precise audio performance and enhanced bass response that will soundtrack your day and inspire your workouts. The in-ear design also reduces ambient noise to a minimum, and the included set of ear-adapters guarantees an individualized fit with 4 sizes (XS, S, M, L) to choose from. A Smart remote and built-in microphone enable you to pause music and take calls across all devices. A tangle-free cable ensures long-lasting listening enjoyment and freedom of movement.