User's Manual

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16
Whistling is common in small amplifier and is known as 'feedback'.
It is caused by amplified sound leaving the ear and receiving back into
the microphone and being re-amplified. The following tips will help reduce the
effect of feedback/whistle noise:
1. Reduce the volume.
Keep volume at lower setting before inserting the instrument in your ear.
2. Secure instrument fitted position
Feedback/whistling noise will stop when the instrument is best fitted/sealed
in the ear with the best fitted dome size.
3. Clear the ear canal of wax or debris.
Seek your hearing care provider for excessive wax built-up.
4. Replace the dome.
Select a better fitted size.
Whistling noise helpful tips
1. How to charge the instrument?
Connect the charging base with Micro-USB cable that connect to AC
adapter which plug into 120/220V outlet or connect the USB cable
directly into computer’s USB port. DO NOT use power bank as your
power sources.
2. How long does it take for the device to be fully charged?
It takes approximately 3.5 hours to fully charged the instrument.
3. How long will the fully charged instrument work until next charge?
Under quiet environment, the fully charged instrument will work up to
25 hours. In some loud surroundings, instrument requires more
power to filter out sounds thus it may result in an insignificant shorter
usage duration.
4. How to know when the hearing instrument is fully charged?
GREEN LED light indicator turns SOLID GREEN at fully charged.
GREEN LED light indicator stays SHINING during charging process.
Charging system functions