The Bose Frames Tempo let you hear the world around you with no obstructions — with a soundtrack playing over everything, while at the same time giving your ears a bit of a break compared to normal earbuds. At $250, they will be a tough sell for some. But I’ve come to realize that audio sunglasses are the exact sort of thing you won’t ever realize you needed. Until you put ‘em on — and all of a sudden, you do