What is the opinion of Reddit about the
IPX7 100% Waterproof & Dust-Proof Floating Bluetooth Shower Speaker – Compatible with All Bluetooth Devices Including iPhone 6, 6s, and Samsung Devices?

I stick this https://www.amazon.com/Waterproof-Dust-proof-Floating-Bluetooth-Speaker/dp/B00KQT38QI on my speedo with a string backup. Works very well.

Ear buds are illegal a lot of places. If you go that route only wear one.

I won one of these from a camel contest. https://www.amazon.com/Waterproof-Dust-proof-Floating-Bluetooth-Speaker/dp/B00KQT38QI

I stick it onto the speedometer with a backup string just in case. Works surprisingly well.