Guaranteed to be seen - Visible from 240 degrees, requires attention from 5 blocks away and provides the space you need to feel safer on the road. Know longer on the road - Gives you peace of mind knowing you have over 16 hours of attention and light. Robust - Waterproof and shockproof aluminum body with two waterproof rubber rings, even in the most difficult terrain. Good weather, bad weather guaranteed Save time and frustration - no tools required; easily install in seconds and instantly remove when parked. 240 degree visibility - total safety 45% of bicycle and car accidents occur at intersections. Get a full 240 degree field of view with each of these little lights. When crossing an intersection, always make sure everyone on either side is alerted. The rear lights of the bike are specially designed with precision-cut openings that allow light to escape from the sides. Hassle-free traffic Bike taillights are sturdy and made of high quality aluminum to withstand knocks and damage. With a reliable and proven design, you can safely ride for more than 26 hours (strobe). Double rubber ring waterproof up to IPX6 waterproof.