阻抗32（ ）类型耳塞式灵敏度45（dB/mW）品牌JOYSHIYA频响范围20-2000（Hz）*采用电子降噪技术，可以营造局部安静的听觉环境，在嘈杂的环境中达到清晰、高质的听觉享受*小耳塞设计方便携带适合MP3或音乐手机使用者*灵敏度：102dB在300Hz时*降噪水平：12dB在300Hz时NoisecancellingheadphoneJH-302*activenoisecancellingtechnologytoenhancethepowerofnoisefiltering*blocktheexternalnoisetoofferasuperblisteningexerience*smartdesign,convenientfortravelingusersespeciallyforusersinnoisyenvironmentlikesubwa,airline,highwayetc*frequencyresponse:20Hz-20KHz*activecancellation:20-1000Hz*sensitivity:102dBat300Hz*reductionlevel:>12dBat300Hz