At night, as long as cyclists ride too fast, we are very worried about their safety, especially when they change the direction, because the bike does not have the direction of the light, We often do not know where do they turn? So we want to design a device that can let us know where do they turn easily and effectively. First, the effect is significant: As mounted on a helmet, the most significant part, whether left, right or brake, the driver of the vehicle to have a certain look, but also cyclists often develop the habit of wearing helmets. Second, easy to install: button device erected beside the handle, easy to install and suitable for a variety of bicycles. Third, the price advantage: lightweight design, so it??s very cheap. Construction: A: lights mounted on a bicycle helmet vents: As bicycle helmets have vents for mounted lights. B: Wireless transmission design: Any distance could be used, safe and suitable for a variety of different height. C: button device: hand-touch design, as long as the thumb of a pressure light will flash for ergonomic.