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（1）根据客户需要可提供说明书以外不同工作电压及负载电阻条件：Besides user’s manual, MIC in different sensitivity under the condition of different working voltage and loading resistance are also provided to meet customer’s requirement.(2)灵敏度随工作电压变化：工作电压在1.5v-3v之间变化在0.     5dB-2dB之间，4.5v以上电压变化很小。Sensitivity changes with working voltage: working voltage changes form 1.5v to 3v sensitivity changes form 0.5 to 2Db;sensitivity changes little above 4.5v voltage.(3)灵敏度随负载电阻变化：在FET线性工作范围，负载电阻增加1倍，灵敏度增高2-5dB左右Sensitivity changes with loading resistance: in FET linear operation the loading resistance doubles and the sensitivity raises about 2-5dB.(4)依I..E.C(国际电子协会)建议,以“Pa”为灵敏度标单位比“ubar”灵敏度标示单位增加20Db例如:-60Db(0dB=1v/ubar)=-40(1v/Pa)We use“pascal(pa)”indication of sensitivity as per the recommendation of I.E.C.(International Electrotechnical Commission ). The sensitivity of“pa”will increase 20dB comparing wit“ubar”indication.Example:-60dB(0dB=1v/ubar)=-40(1v/Pa)