PDW Radbot 1000 Taillight. Features: Equipped with a precision reflector that conforms to strict EU standards 3 modes: zZz pop, cornea blitz and rock steady modes (30 hours runtime flashing/15 steady) Stayputnik seatpost mount attaches without tools and has vertical adjustment setting Rack/seatpost/seatstay mounts or backpack clip usage. (2) AAA batteries included Specifications: Brightness: - Battery Type: AAA Run Time: 30 Hours (Max) Beam Color: Red Color: Clear Weight: 62g