I use a Hisonic system. Very inexpensive. I wear a baseball style hat and clip the transmitter to hat in the back. I put the transmitter in two ziplock bags. I put a small hole in the first bag so the mic cord comes out the top. And then a hole in the second bag so the mic cord comes out the bottom. I put a rubber band around the bags just to keep it tight. The clip on the back of the transmitter fits the double bag and the strap on the back of the hat. I can turn on and off the transmitter without removing the bags. It is pretty compact and I actually forget it is there sometimes. This has worked well for me for over three years. The mic has gotten wet a few times, but never stopped working. There are some water proof products that I saw when I was looking for a way to bag the transmitter. But I don’t recall the names. And the Hisonic system is very portable, has bluetooth for music, and a internal rechargeable replaceable battery so no electric cords on the pool deck.