Have 2 pieces purchased at a sadly does the power button does not correctly (went to Amazon back against replacement) is used as additional light (to have light in stand) and is at my average speed of 15 - 25 km / h absolutely i. O. Good luminosity / distance (slightly narrower beam approximately 5 m diameter 10 - 15 meters), easy tool-free mounting of the holder on the handlebar, a simple sliding mechanism to fix the lamp. -..> A drop of salad oil or similar to the guides works wonders. Would buy the product again considering the price and also a friend - to an article in the significantly higher price segment, which are indeed also available I would put much higher expectations for the quality of workmanship. However, since the development of the LED area is advancing fast, this is a good solution for 1 - 2 years
