Retrospec Bicycles Bondi-2 Super Bright 2 LED Urban Commuter Silicon Bike Light 2 LED Waterproof Silicone Bike Light is the brightest of its kind and attaches in seconds without any tools 3-Mode control visible even in bright day light and ideal for night time 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