Fearless Audio is a Chinese company that specializes in in-ear monitors. I would like to thank Fearless Audio and Penon Audio for the review unit of S4. At the moment, you can purchase the S4 from Penon Audio.
- Driver Configuration: 4 Balanced Armature
- Frequency Response: 20Hz – 20kHz
- Impedance: 32 ohm
- Sensitivity: 114dB/mW
Unboxing & Accessories
The S4 comes in a white package with a protective cover that sports the words, “CLASSIC NEVER ENDS”. Inside the package, there is a hard carrying case which contains the S4, detachable 0.78mm 2 pins cable, tips, cleaning cloth, instruction manual and warranty card.