Bluetooth speakers are everywhere these days, and with good reason. They offer wonderful portability and convenience, connecting you to your tunes regardless of where you are and, in many case, offering you wonderful sound quality under the circumstances.
I've reviewed many such speakers over the years, from audiophile-quality versions (as much as Bluetooth can be audiophile quality) such as Bose's SoundLink Mini to solar powered units such as the Etón Rukus. Most have at the least been intriguing, and all have at the least been very convenient.
