Meet the Mogics Light: a multi-functional light with 3 modes you can control with 1 button. It has normal, signal, and shimmering light. More importantly, it can float or sink (your choice). Think about the possibilities here. You can use these to stay visible outside, have a romantic time with your partner inside, and do a whole lot more. Its rechargeable battery can be charged via USB.
The product is available on Kickstarter.