Max Sound Output: 129dB ± 4dBMax Sound Gain: 45dB ± 5dBHarmonic Wave Distortion: ?5%Frequency Range: 450~3500 hzInput Noise: ?30dBBattery: A675 Zinc Air Battery Working Voltage: dc1.5V Working Current: ?3mA Color: As the picture showsNet Weight: 8g Features:Use of Zinc Air battery can work 25-30daysLow power consumptionVolume Control;On/off swicthMaximum sound gain up to 45dBAcoustic conducting pipeAccording to the user's ear size to cutting the acoustic conducting pipDifferent size noise prevention earplug
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