1: gently open the battery cover, press positive negativedirection into a grain and the corresponding model buttonbatteries, close the battery cover;2: the ear hook on the hard of hearing, and then will be andtry to plug the ear plug into. (note: the machine should beclosed at this time, that is "OFF", the volume knob shouldbe in the small voice gear, or within the earphone plugintothe machine to produce feedback sound a fraction of asecond (i.e., whistlers) may cause discomfort.)
3: to "ON" switch "OFF" gear gear, and then adjust thevolume knob, clockwise, according to their own sense ofhearing, to select the suitable volume;
4: when using the volume of whistlers, because the siliconeear plug is not tight, cause the voice feedback, please checkwhether the size of the silica gel earplugs, silica gel earplugsis plugged, if feel to plug the ear plugs, please change tochoose more consistent with the size of the wearer ear canalof the specifications of the silica gel earplugs tightly sealedear canal, don't leak;
5: when stop using hearing aid, please put the power switch in "OFF" position, so that can save electricity.
Note: Not suitable for use of the crowd:Serious heart disease,suppurative otitis media; Carry inpatients with cardiac pacemaker and allergy to this product material, ear skin ulcers is forbidden to use