Tail Bright 9x. 9 Ultra-bright Bicycle Tail Light with Built-in Reflector. Water Resistant. 2 AAA Batteries. 3 Modes: Flashing/ Constant/chasing. 50 Hours Burn Time. 900 Meter Visibility. Seatpost and Seatstay Clamps and Rubber Frame Protectors. Clips to Bags. Ce Compliant. Rohs Certified Chemical Free. Just a Great Light.