Creative beginning ZEN Aurvana. This premium earphones, which have substantially reduced to 90% of ambient noise. ZEN Aurvana in ear headphones feature oxygen-free copper cable and gold-plated plugs to ensure a clean signal path and stunning sound reproduction at all volume levels. It frequency response of 20Hz to 20 kHz, the sensitivity of 115 dB and noise isolation of up to 20 dB. Creative AuraSeal noise isolation technology blocks up to 90 percent of ambient noise.