Portland Design Works Radbot 1000 Tail Light 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 batteries, backpack clip, and New Stayputnik seatpost mount attaches without tools zZz, zZzPOP!, cornea blitz, and rock steady modes; lifetime warranty against defects