Light, powerful and autonomous
"I bought it for my daughter and discovered that it performed as well as mine, which is much bigger and bulky (and expensive) and yet has less autonomy. I used the BBB spark on an 8-hour outing in flashing mode (not the most economical) and there was still plenty of room. I bought a second one for my road bike and keep the old one for the velotaf in town. It has 4 lighting modes (2 fixed and 2 flashing) and defaults to the last one used. What could be simpler?"
