Hearing enhancement is available for dancers who need it.  Most cuers in our are use the Williams Sound transmitter at 72.9 MHz.  This is the standard frequency for Cued Ballroom (Round Dance) world-wide.

Receivers are widely available online.  Compatible models:
Williams Sound PPA-R37  – The most popular model.  Costs about $100-$125.
Williams Sound PPA-R38  – Has a screen, but no better sound quality than the PPA-R37.  Costs about $150-$175

TIVDIO HRD-102.  Costs less than $15.  Available on Amazon and Ebay.