Closed ear cover design provides for perfect isolation of external noise | Delivers an immersive audio and enhanced bass experience | Contains buttons that allow hands free calling experience | High-sensitivity microphone to reduces ambient noises and grasp the detail of voice | Built-in rechargeable Lithium battery lasts up to 8 hours of talking time | The speakers inside the EarPods have been engineered to maximise sound output and minimise sound loss, which means you get high-quality audio | The best-wired headsets should be designed ergonomically to provide maximum comfort