Three-mode, 1.0-watt red LED taillight made for biker safety * 30-hour runtime in flashing mode; 15-hour runtime in steady mode * Precision Euro reflector; weather resistant build; 1.5-second hold switch * Comes with two AAA batteries, backpack clip, and rack, seatpost, and seatstay mounts * zZz, zZzPOP!, cornea blitz, and rock steady modes; lifetime warranty against defects