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TIPS:
• Whistling/feedback occurs when amplified sound leaks
out of the ear and returns to the device microphone and is
re-amplified.
• If you experience feedback at higher volumes try
changing a new dome with right size for you.
• For optimum performance, replace ear tip every one or
two weeks. Any blockage inside your ear, like ear wax, can
cause a feedback reaction.
• Avoid physical shock like dropping your device on a hard
surface. Avoid exposure to moisture or heat.Store in a cool,
dry place.