The Cateye AMPP 1100 & AMP 800 are compact, designed to powerfully light the way ahead & never compromising on quality.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% The body of the AMPP 800 is constructed of light & sturdy 6063 aluminium with a scratch-resistant finish to protect the sleek look. The light attaches easily to bars up to 35mm as well as some aero bars via the Fex Tight bracket for truly secure attachment. The lens features Opticube lens technology which provides supreme light distribution, helping you see even further with 800 lumens behind it. The light memory mode ensures that you're light turns on in the same mode that you turned off, saving the faff of cycling through modes. The power button illuminates to give you a constant idea of battery level, too, so you won't get caught out in the dark.