Maybe it's because we're all about Feng Shui in the office, but we're partial to gadgets with minimal design. And the Hidden Speaker ($120) is definitely one of them. The Hidden Speaker features a unique design that integrates a speaker into a sleek enclosure that doubles as a volume knob. The more you lift the cap and expose the speaker, the more sound you'll enjoy. The Hidden Speaker runs on rechargeable batteries with 30 hours of uninterrupted play time on a single hit. It uses Bluetooth to wirelessly stream audio and has a built-in AM/FM radio.