When the weather is glorious and you have a decent tune playing in your ears you can feel on top of the world, even when you are walking to somewhere hideous like the DVLA, the Viper sunglasses from Zungle cut out the cumbersome combination of headphones and sunglasses or earphones with their dangling wires by turning the sunglasses themselves in headphones. The Viper uses bone conduction and Bluetooth to allow you to listen to your music wirelessly but at the same time keeps you connected to the world around you.