Lightweight and Comfortable – super light soft design. Total squishy silicone is incredibly comfortable for 24hrs wear. 3.5mm jack. Speaker impedance: 16Ω±15%. Frequency Response Range: 20Hz-20KHz High-quality silicone earbuds multifunction button, unit size-10mm (dynamic speaker), Powerful, bass-driven stereo sound; Sensitivity – 96dB+3dB Optimized for mp3, iPod, iPhone, CD players, and portable gaming systems Tangle free cable