Headset maker Jabra was demonstrating the latest version of its Jabra Rox Bluetooth earbuds. Intelligence within this dirt- and perspiration-resistant headset automatically turns off power when removing the buds, which clock together like a necklace. "Because they're made of steel, we were able to do some creative things with magnets," said Jason Hussey, an indirect account executive with Jabra. "Power comes back on when they're pulled apart and they pair with your device by the time they're back in the ears," he said. For $129 list, the device also works as a wireless headset and can remotely answer calls. "Most runners won't necessarily be making calls, but they'll usually take one if it comes in."