The Cateye AMPP 1100 uses a compact twin-LED design to powerfully light the way ahead, whatever the terrain throws at you. 1100 Lumen maximum output for 1.5 hours Twin Opticube lens technology for supreme light distribution Tough, scratch resistant ADC12 lens & LED front section, with a lightweight polycarbonate-encased rear battery section Flex Tight bracket – suitable for bars up to 35mm diameter & selected aero bars Power button constant runtime indicator: Blue +50% / Yellow 50-30% / Red 30%-0%