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Specifications:Pocket Hearing aidMax Sound Output: 1294 dBMax Sound Gain: 60dB 5dBHarmonic Wave Distortion: ?%Frequency Range: 250~3800 hzInput Noise: ?0 dBBattery: 1 x AA battery (included) Working Voltage: dc1.5V Working Current: ?mA Color: As the picture showsItem Size: 6.75 x 4.35 x 1.9cmNote:Adjust volume to the minimum before wearing.Choose an earplug of slightly bigger size to avoid whistler.Increase volume gradually to avoid sudden increase in sound.If you hear a howling, check the ear (silica gel) is appropriate and whether the size of plug is tight, the appropriate choice of earplugs and plugged, make sure no air leakage.Keep the ear plug cleanRemove the battery if you don't use it for long time.includes:1 x F-28 Hearing aid 4 x Earplug (different sizes)1 x AA battery1 x Screwdriver1 x User manua