Optimized for travel and uncompromising audio, the Etymotic ER4-S Micro Pro Earphones are a great choice for audiophile-grade listening on the go. Made from thick, sturdy plastic, these earphones hold powerful balanced armature drivers that deliver crisp, extended highs, energetic mids, and booming bass. The neutral tone of the ER4-S gives you accurate audio with tons of detail and instrument separation. Featuring a deep, comfortable fit and a maximum attenuation of 42dB, the ER4-S Micro Pro Earphones offer impressive isolation—great for noisier environments. Each pair includes a selection of silicone and foam ear tips.