The Cateye Orb Bar End Rear Bike Light Set will help you stay visible day or night. With constant or flashing modes to improve your chances of being seen, both from the back and from the side, Orb Bar End Lights increase your visible width on the road.Cateye Orb Bar End Light Set FeaturesDurable aluminium construction with polished black finishEasy to insert into the end of road bike handlebars with an inner diameter of 18.5mm-22mmThe lens acts as power/mode buttonLow profile, low weight – only 20g eachStrong sideways visibility2 x 2032 batteries includedCateye Orb Bar End Light Set SpecificationsMode: Output, RuntimeConstant: 5 Lm, 50 hrsFast Flashing: 5 Lm, 100 hrsSlow Flashing: 5 Lm, 100 hrs