They’re an ingenious lot, the Swiss. The latest offering from the country that bought us handy pocket knives and, er, cellophane, comes the OYO Ballo Speaker. Compatible with all of your mobile gadgets, though they’re mono, run a pair of them through a splitter for stereo sound and if you’re in possession of a couple of mighty jug ears, you could even use them as plugs. A range of rubber bands are available for both the customization and protection of your balls.