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Telephones magnet.
1) Environment of use: Temperature: -10 ~ +40 ° C, relative humidity ≤ 95%;
2) Working Frequency (Hz): 300 ~ 3400;
3) The level of electricity generation Reference: ≤ 0 dB;
4) reference receiver power level: ≤ - 4 dB;
5) sidetone reference power level: ≥ 10 dB.
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