90 degree adjustable beam angle - Why customers don't like the old traffic light? The old light cannot illuminate the ground in front of you. That's it. Our engineers have developed a 90 degree adjustable vertical beam to meet the demands of runners on hills and slopes.Lighting distance: the light beam illuminates the path in front of the runner at a lighting distance of 25 meters for detect possible obstacles or dangers. It is much wider than the old style. Long battery life - 2 manual brightness settings: 4 hours with 500 lm (High Light) and 10 hours with 125 lm (Low Light) to ensure you achieve the desired brightness with just one button. And the USB rechargeable light is outdoor waterproof, convenient, reliable and durable.Visibility of any environment - This is one of the most innovative and efficient security lights on the market. The reflective elastic bands and the two flashing red LEDs on the battery cover allow riders to be seen by the driver and avoid an unnecessary accident in the dark. And the little "hood" prevents the front beam of light from dazzling the rider. Comfortable to wear - Each strap is 4 inches longer than the old style, to fit different groups of body and achieve the most comfortable state, even fat runners, it is zoomable and durable. The high-elastic adjustable chest strap allows you to adjust the length and tension to your body to keep the body around and avoid moving so you feel comfortable during training.