Topeak redlite mega rear light topeaks brightest and most technical rear light features 1 piranha high flux red led and 4 additional super bright leds 2 red 2 yellow to provide an impressively bright and extremely visible signal to other road users water resistant attaches to your seatpost with the included mount or to any topeak wedge or turnkbag saddle bags 5 functions constant flashing sequence 1 sequence 2 and hybrid flashing battery included 2 x aaa dimensions 75 x 37 x 38 c