*采用電子降噪技術，可以營造局部安靜的聽覺環境，在嘈雜的環境中達到清晰、高質的聽覺享受*小耳塞設計方便攜帶適合MP3或音樂手機使用者*靈敏度：102dB在300Hz時*降噪水平：12dB在300Hz時NoisecancellingheadphoneJH-302*activenoisecancellingtechnologytoenhancethepowerofnoisefiltering*blocktheexternalnoisetoofferasuperblisteningexerience*smartdesign,convenientfortravelingusersespeciallyforusersinnoisyenvironmentlikesubwa,airline,highwayetc*frequencyresponse:20Hz-20KHz*activecancellation:20-1000Hz*sensitivity:102dBat300Hz*reductionlevel:>12dBat300Hz