Our gym teacher recently started using a wireless mic but had a lavalier mic in hand. After speaking to a few local spin instructors I chose this one for him. He was very happy with the sound and comfort and especially happy that he now has his hands free. For a month of daily use, there were no problems. Rotation teachers told me that after a few months they had problems with the mics failing due to the excessive sweating that the mics had to endure. This shouldn't be a problem for our purposes, but I'll be sure to update if it turns out to be a problem.
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