I am the proud owner of a fancy iPod speaker, not dissimilar in looks to a black Lego brick, with a sleek and streamlined exterior and four round buttons on top. It’s lovely. And it works pretty well, except that when it’s plugged in it emits the kind of high-pitched noise that is surely only designed for dogs to hear. Unfortunately for me, my ears are still so youthful that they pick up this particular frequency. Excellent.