The new CUBE Helmet Rear Light is slightly larger than its predecessor. It fits all X-Lock helmets and simply twists on and off for quick and easy attachment and removal. There's a flashing mode to save battery power, and the button cell battery swaps out in seconds. With its stylish square design, this mini light is the perfect complement to the new generation of helmet styles. And we also made it splashproof, because that's how we roll.