The newest addition to the Redlitefamily uses 1 high-flux Piranha LEDand 4 super bright LEDs providing 5Lumens, making it 20x brighter thana standard tail light. Redlite mega hasa 280° visable light pattern, upto1 mile. 2 AAA batteries provide amaximum run time of 100 hrs. Features 1 High-Flux Piranha Red LED, 2 YellowAnd 2 Red Super Bright Leds 5 Modes: Constant, Blinking,Sequence 1, Sequence 2, HybridBlinking BULB:1 Watt LED BATTERY:1.5V AAA X 2 Pcs BURN TIME:Constant 50 Hrs,Hybrid Blinking 50 HrsSequence 1&2 100 Hrs, Mounts To Seatpost OrTopeak Bags 7.5x3.7x3.8cm 64g (Light Only)