Bicycle Taillight has 180 degrees of illumination, ensuring you will be seen from both sides, as well as from behind. 5 Super Bright LED's, 2 Functions: Steady and Flashing, Requires 2 AAA Batteries (not included). BIKE SAFETY LIGHTS are the safe and convenient way to illuminate your bike. These lights are visible at distances up to a mile. Convenient bungee closure attaches to any bike. Long Lasting LED Rated at 100,000 Hours of Use.