Etymotic Research HF5--High Clarity, Great Fit, and Maximum Noise Isolation. The HF5 delivers a near-perfect music experience, even in high surrounding noise conditions. Like Etymotic"s earlier generations of in-ear earphones, the HF5 is built on superior noise isolation, so you experience total sound immersion when listening to your music. The HF5 is compatible with all iPod models and music players that accept a 3.5mm plug. This package includes the HF5 in-ear earphones, assorted eartips for your comfort, a filter changing tool with filters, and a protective carrying pouch.