Stay visible day or night with CatEye’s Orb Bar End lights. 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. Durable aluminium construction with polished black finish Easy to insert into the end of road bike handlebars with an inner diameter of 18.5mm- 22mm Lens acts as power / mode button Low profile, low weight – only 20g each Strong sideways visibility 2 x 2032 batteries included Mode: Output, Runtime Constant: 5 Lm, 50 hrs Fast Flashing: 5 Lm, 100 hrs Slow Flashing: 5 Lm, 100 hrs