Noise isolating headphones are great for blocking outside noise, but this also means anyone can sneak up on you like a ninja. With the Audio Bone Headphones ($140), you can listen to your music and still be aware of your surroundings. This is all thanks to a technology called Bone Conduction. Audio Bone bypasses the eardrum and transmits stereo-quality music through a listener's bones directly to the inner ear. The result? A perfect combination of audio and ambient noise, making these headphones perfect for runners, cyclist, and mall walkers.