Product performance and parameters:
<br />A.Max.saturater volume output:135±5 dB.
<br />B.Max voice gain:55±5 dB
<br />C.Harmonic distortion:<10% 1000hz
<br />D.Equivalent input noise level:30dB
<br />E.Frequency range:300-4500 Hz
<br />F.Battery voltage:DC1.5V(The A76 button battery a grain)
<br />G.Directivity: omni-directional
<br />Method of using:
<br />1: gently open the battery cover, press positive negative direction into a grain and
<br />the corresponding model button batteries, close the battery cover;
<br />2: the ear hook on the hard of hearing, and then will be and try to plug the ear plug
<br />into. (note: the machine should be closed at this time, that is "OFF", the volume knob
<br />should be in the small voice gear, or within the earphone plug into the machine to produce
<br />feedback sound a fraction of a second (i.e., whistlers) may cause discomfort);
<br />3: to "ON" switch "OFF" gear gear, and then adjust the volume knob, clockwise, according
<br />to their own sense of hearing, to select the suitable volume;
<br />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
<br />consistent with the size of the wearer ear canal of the specifications of the silicagel
<br />earplugs tightly sealed ear canal, don't leak;
<br />5: when stop using hearing aid, please put the power switch in "OFF" position, so that can save electricity.
<br />Not suitable for use of the crowd:
<br />Serious heart disease, suppurative otitis media; Carry in patients with cardiac pacemaker
<br />and allergy to this product material, ear skin ulcers is forbidden to use
<br />Packing materials
<br />One color box packaging, product into a blister, a black plastic box, and then the outside
<br />with color box packaging.
<br />Single box:  N.W:13g            G.W:90g           SIZE:4.1*2.3*1.1CM