Engineering:Audio boot
From HandWiki
An audio boot or audio shoe is an electronic device used by the hard of hearing with hearing aids; hearing aids often come with a special set of metal contacts for audio input. Typically the audio boot will fit around the end of the hearing aid (a behind-the-ear model, as in-the-ear do not afford any purchase for the connection) link these with another device, like an FM system or a cellphone or even a digital audio player.[1]
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