Two energy-efficient red LED lights provide 35 hours of constant light or 160 hours of flashing.The Knog Beetle taillight is a sleek, one-piece unit made out of slim, flexible silicone that wraps around virtually any seat post or seat stay, eliminating the frustration that accompanies the installation of most bike lights. Two super-bright red LED lights keep you visible up to 1,800 feet down the road.