B5 maximum brightness up to 340 lumens, the aluminum-magnesium alloy shell, with a very wide angle of illumination, and does not affect a vehicle in sight, the light weight of only 90g, with a weight of 120g capacity 2600mAh lithium battery, the longest lighting time of 12 hours, it issuitable for the installation, road bike or mountain climbing on board, is the best safety features in the city, country night riding.