The Hearing Helper FM Tour Guide System, model TGS PRO MULTI, helps tour group members with hearing difficulties overcome background noise and distance from the guide. Use it in factories, museums, power plants---anywhere hearing assistance is needed. The Hearing Helper� Tour Guide System features eight selectable operating frequencies on 72-76 MHz. As a result, multiple tour guide systems can operate within the same location, simultaneously, with no crosstalk or interference. System includes one (1) T32 transmitter with MIC 096 microphone, ten (10) R35-8 receivers, batteries, and a system carry case.