BV Ultra Bright Powerful 5 Red LED Bicycle Rear Taillight, Built-in Reflector,Flashing, Chasing and Steady Mode, Special Design to Mount on Racks,NO Questions Asked Replacement Guarantee 5 super bright red LED's light keeps you safe under low visibility conditions 3 modes (flash, chasing and steady) help to alert drivers of your presence on dark roads Bicycle taillight for night riding Built-in reflector AAA x 2 (Not Included)