Cateye sync set core kinetic light set the perfect commuter light set including a 500 lumen front light and 50 lumen rear light.synccateyes sync set core front light and kinetic rear light come with sync technology which lets you fully control the lights via the cateye sync app. The app lets you control the lights quickly and easily ndash turning the lights on, off and switching between modes.light modesboth lights come with a collection of light modes which can easily be switched between using sync technology or by using the lights power button. Both lights include a daytime hyperconstant hyperflash mode which allows you to stay visible even in direct sunlight. The rear light also comes with a group ride mode that keeps you seen but minimises the distractions for fellow riders following in your trail.sync core front lighthigh 500 lumens ndash 2 hoursmiddle 150 lumens ndash 9 hourslow 100 lumens ndash 15 hoursdaytime hyperconstant 500 100 lumens ndash 18 hoursflashing 100 lumens ndash 130 hourssync kinetic rear lighthigh 40 lumens ndash 1.5 hourslow 4 lumens ndash 15 hoursflashing 30 lumens ndash 50 hoursgroup ride 40 lumens ndash 15 hoursrapid 50 lumens ndash 20 hoursdaytime hyperflash 50 50 lumens ndash 30 hourskineticthe rear light comes with kinetic light technology which uses a built in speed sensor which senses when youre decelerating and automatically changes the light output up to 50 lumens. This makes fellow riders and motorists at your rear sense youre slowing down so they can react in plenty of time. Usb rechargeableboth lights come with rechargeable batteries with charging cables that allow you to charge the lights via any standard usb port. Using the cateye sync app you clearly see your lights batterys battery lives and know when its time to charge.mountingintegrated into the design of both lights are mounting straps with adjustable designs which allow you to easily connect the lights to your handlebar and seatpost. The mounts also make it easy to take the lights off your bike frame in a hurry which is especially convenient for commuters.featuresincludes front and rear lightdaytime and group ride modeskinetic rear light technologysync systemintegrated mounting straps360 degrees of visibilityusb rechargeablefront light weighs 94grear light weighs 43gbuy cateye lights from chain reaction cycles, the world's largest online bike store.