Retrospec Bicycles Bondi-5 Super Bright 5 LED Urban Commuter Silicon Bike Light 5 LED Waterproof Silicone Bike Light is the brightest of its kind, and attaches in seconds without any tools 3-mode control of rolling, flashing and constant bright light Visible up to 1/2 Mile and long lasting batteries are included Each light contains five Super Bright 15000mcd LEDs Quick and easy tool free installation in a matter of seconds