Typically, shower speakers work the same way that any portable Bluetooth speaker works with additional protection from water and other liquids. When paired with a smart device, like your phone or computer, these speakers can play audio using radio frequency waves (RFI) rather than through audio cables, making them suitable for bathroom use. It’s best to select a speaker with a long Bluetooth range and onboard controls so you can control your music without bringing your device into the bathroom and risking damage.