Brand: Cyber SonicIncluding 3 batteries, ear plugs, manual and a carrying case.Amplify sounds up to 40 decibels.It weighs less than 10 grams.With 6 Volume Levels which you can easily fine tune as needed.High-Definition Digital sound reproduction.It conforms to either ear.Increased sensitivity equals better hearing.More accurate sound reproduction.Delivers more distortion-free sound.Quiet Performance with less circuit noise.vv1. Gently open the battery cover, press positive negative direction into a grain and the corresponding model button batteries, close the battery cover.2. The ear hook on the hard of hearing, and then will be and try to plug the ear plug into. (note: the machine should be closed at this time, that is “OFF”, the volume knob should be in the small voice gear, or within the earphone plug into the machine to produce feedback sound a fraction of a second (i.e., whistlers) may cause discomfort).3. To “ON” switch “OFF” gear gear, and then adjust the volume knob, clockwise, according to their own sense of hearing, to select the suitable volume.4. When using the volume of whistlers, because the silicone ear plug is not tight, cause the voice feedback, please check whether the size of the silica gel earplugs, silica gel earplugs is plugged, if feel to plug the ear plugs, please change to choose more consistent with the size of the wearer ear canal of the specifications of the silica gel earplugs tightly sealed ear canal, don’t leak.5. when stop using hearing aid, please put the power switch in “OFF” position, so that can save electricity.
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