This is kind of like the utensil drum sticks. It doesn't really serve a purpose. It's just a sponge shaped like a microphone. You can do this with your shampoo bottle if you wanted. Or just grab a normal sponge. Once you're squeezing it they all look the same anyway. What I'd really like to see is a functioning, waterproof microphone. Let me really belt it out in my shower. My neighbors would love that!
I'm a big singer, but never in the shower. For some reason I get embarrassed in the shower. I think it's because my neighbors can hear me more, even though I sing so loudly in my living room that there's no way they don't hear me there. It's all psychological. Maybe this sponge can help me break my mental block.