The title sums up the product. With a colleague, we bought two for cycling outings after taf winter. Lighting is more than enough to do fun night even mountain biking. I pass over the autonomy and heating as given the price we must not ask too much. The real downside is its reliability !! Lamp to my colleague dropped after 7 outputs (faulty internal electronics) and mine quite 4 outputs better! We thought getting a good deal, a third colleague with a model 150 (approx) uses his own weekly two from approx. So the conclusion is quickly made by me ... I would invest a little more for the next one!