» Telecommunications Equipment
The Geemarc CL400 is designed to help those with a high frequency hearing loss, a problem affecting up to 95% of hearing impaired people. Those with high-frequency hearing loss can't hear sounds like st and ch, so words like stair and chair sound like air. Just increasing the volume doesnt always help because it amplifies all frequencies. The Geemarc CL400 telephone features a built-in sound equalizer that selectively increases the volume of high or low frequency sounds. This equaliser should help those with a high-frequency hearing loss.
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British Deaf Association