Top features: – EXTRA BASS enhances low-end frequencies to bring your music to life – Enjoy hours of comfortable listening – In-line microphone lets you answer calls on the go without removing the headphones EXTRA BASS enhances low-end frequenciesThe MDR-XB550AP feature EXTRA BASS technology to enhance the low-end frequencies of your music. This helps to create a deep and powerful sound for an immersive audio experience.Enjoy hours of comfortable listeningYou can listen to your favourite music for hours in comfort using the MDRXB550AP. With soft cushioned earpads and an adjustable metal headband, you can enjoy your songs for longer. In-line microphoneYou can use the in-line microphone of the MDR-XB550 to answer calls from your smartphone without having to remove the headphones. There is also an in-line remote which lets you skip between tracks and control the volume directly from the headphones.