Sigma Eloy/Cuberider Bicycle Headlight/Tail Light Combo Set - 11817 Eloy and Cube Rider both have 4 high performance LEDs 2 modes: permanent and flashing Fast tool-free mounting Eloy extremely long burn time up to 100 hours, and side visibility through special shape of lens Batteries included on both lights, 3AA on Eloy, and 2N in the Cube rider Watertight and lightweight