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II. APPLICATION SCOPE
Used for hearing compensation of air-conduction hearing loss suffers
III. USING METHOD
1. SEE THE POSITION AS SHOWN IN THE FIGURE
2. VOLUME ADJUSTMENT
Firstly, adjust the volume knob to the position of 2 or 3 to test whether the volume of
hearing-aid is normal:
Use the thumb to press the knob to rotate upwards or downwards lightly and slowly to
the appropriate sound.
3. SELECTION OF THE APPROPRIATE EARPLUG
The appropriate earplug shall be selected. Users with large ear canal select the large
earplug. Earplugs with three different sizes are equipped with the device (ensuring the
close fit of earplug and ear canal. Otherwise, it will give rise to the sound feedback,
causing whistler accordingly)
4. WHISTLER
It's also called acoustic feedback, which is a normal phenomenon occurring in working of
hearing aid. It is more likely to occur to the one with larger power and higher power. In the
event of it, the following methods shall be used for improvement:
1. Reduce the volume
2. Fit the earplug and air canal closely or replace with larger earplug, ensuring the sound
not leaked or leaked as little as possible
3. Turning up gradually, and then leave the hand away from the ear, avoiding acoustic
reflection. At this moment, the whistler will be controlled.
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