The Klipsch Reference S4i features 8.5mm drivers to pump out sound. The earphones are also iPhone compatible and come with an in-line control pod with three buttons for controlling volume and music playback.
| Type | Dynamic Moving Coil |
| Driver Unit | 8.5mm |
| Frequency Response | 10Hz to 19,000Hz |
| Impedance | 18 Ohms |
| Sensitivity (1kHz) | 110 dB |
| Input Plug | 3.5mm |
| Other features | Three Button In-Line Control Pod |
| Net Weight | 11.9g |
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