Esquire

"The entire back of the helmet is a panel of lights that react to your directions while you scoot, bike, or board—flashing warning lights to signal that you're slowing down, pulsing lights to make you generally visible as you ride, illuminating bright arrows pointing to the right or left to signal turning."

“The bike powers up in seconds, and if you want, when you’re done, you can even remove the battery and plug it into the wall to charge.”