Going for a run? Put an app like RunKeeper on your iPhone and a headset like the $99 Jabra Sport on your ears. Designed for athletes in motion, this Bluetooth-powered stereo headset connects wirelessly to your iPhone, which can ride along on your belt, an armband, or wherever. Sick of your playlist? Switch to FM radio mode with the push of a button. Need to make or take a call? The Sport offers a wind-shielded microphone and active noise cancellation.