There are plenty of ways to listen to your music when you’re not within arms’ reach of a wall outlet. Most of them don’t look, or perform, anywhere near as good as the ones from Tombox. The Germans take discarded loudspeakers and repurpose them as portable amplifiers. Each Tombox is created individually, so they’re all a little different. But they do have some common DNA in the cool cable management for the 3.5mm audio plug and the built-in, rechargeable battery that can last up to two weeks on a single charge.