Busier clubs, ones that have 4 or 5 classes in a block every evening, have found that what's best is to have 2 x Aeromics and 2 x Transmitters and rotate them. This way they get an hour's dry out time between uses.
This is sensible practice as the poor instructor of the 4th or 5th class has to use a mic set that's soaking wet with other people's sweat! Yes you can dry them off with a dry sweat towel (not gym wipes of any kind please) but they're still icky! Getting a second mic and pack set makes so much sense.
Keep both sets connected for as long as possible to prevent wear and tear on the connectors. Our 2 Year "No Sweat" Warranty* (conditions apply) covers both items against sweat damage.
Choose between an Aeromic and Cyclemic. Check the frequency of the Fitness Audio transmitter you are currently using to make sure you order the same one again.