Available in Red and White LED Colors Glow and Flash Modes Weather resistant Battery Life: 20 hours Glow / 25 Hours Flash Includes easily replaceable batteries - 2x CR2016 Lithium Easy to attach and detach - no tools required! Includes two 7" Gear Ties to easily grip to nearly any bike surface. Gear Tie Technology - Tough rubber shell provides excellent grip anywhere on your bicycle, but won't scratch or mark. Gear Tie Technology - Strong internal wire that holds its shape. Gear Tie Technology