Klipsch Reference S4i Premium In-Ear Noise-Isolating Headphones with Microphone (Black) (Discontinued by Manufacturer)
Revolt against on-hold music. Control your playlist and calls with the latest technology. The Klipsch Reference S4i  packs a punch along with its 360-degree microphone. Patented headphone features and legendary Klipsch performance combine to replicate the sound of Reference speakers. Connect with the S4i, and the Reference bloodlines become unmistakable.