Finally, a wearable that you can use for at least six months without charging it. The new Misfit Ray sleep and activity tracker ($100, preorder) promises to run on a single battery for that long and do even more than its other well-known products. Not only is the design sleek, but it will also come in two finishes: rose gold and carbon black. It's water-resistant for 50 meters, so consider it perfect for a bath or limited diving. Oh, and did we mention it will fit into different accessories, so you can wear it as a necklace too? Yeah, the Misfit Ray is one stylish and useful item.