With so many small Bluetooth speakers on the market today I think using rocks in the garden is almost obsolete. My daughter has one that is about the size of 2 packs of cigarettes, and I can;t believe the sound that comes out of it, and it was only about $50. If you want music outside, or in the garage, or anywhere, and the music is stored on your cellphone in your pocket, then these little devices are a no-brainer.