Mount this light on your bicycle to be seen and to be safe. This light features 10 LEDs in two rows of 5. Each row of LEDs can be controlled individually. Row light modes include steady on, flashing, and fast/slow light oscillation. Or alternated, so one row can be steady on while the other row is flashing or any combination of the functions. It also includes an internal reflector which helps intensify the brightness of the LEDs. (Batteries NOT included)