The connector of Ultramini light and the connector of power source should be compatible, which must be ascertained before the purchase of the product. The light weight 25grams is another advantage of U2. Many bicycle lights can be damaged by vibration or impact during riding, U2 weighs only 25 grams, minimizing the impact. Because of it’s light weight, we can also use very small brackets can be placed in various positions, like fender and stem.