Cateye sync kinetic 40 50 lm rear lighta great commuter rear light that suits a range of bike frames with multiple light modes, full control via the cateye sync app, and automatic sensor control via the kinectic system.cateye synccateyes sync kinectic rear light comes with full control through the cateye sync app available through google play and the app store. The app provides full control over the bike light and with a couple of taps on your smartphone you can turn the light on, off and change light mode. You can also view your lights real time current battery life. This is especially useful when using multiple cateye sync lights.opticube lensthe light comes with an opticube lens which spreads the beam of the 5 red leds providing excellent side visibility which is great for cyclist moving through built up urban areas.light modeswith 6 different light modes the light comes with various outputs which suits a range of different conditions and your depleting battery life. A specialised group ride mode provides an output which will keep you visible but doesnt distract fellow riders. Meanwhile, the daytime hyperflash mode will keep you seen during daylight hours. High 40 lumens ndash 1.5 hourslow 5 lumens ndash 15 hoursflashing 30 lumens ndash 50 hoursrapid 50 lumens ndash 20 hoursgroup ride 40 lumens ndash 15 hoursdaytime hyperflash 50 lumens ndash 30 hourskinectic lightingwith a built in acceleration sensor, the light automatically detects when youre decelerating and boosts the lights output to 50 lumens. This helps keep fellow road users aware of your movements ndash ensuring they know when youre stopping and preventing accidents.usb rechargeablein built into the interior of the light is a lithium ion polymer battery which is usb rechargeable and provided with a micro usb cable. You can easily plug the light into any standard usb port for quick and easy charging on the go. The light takes just 2.5 hours to fully recharge and has a battery life of up to 50 hours.mountingthe light comes with an integrated seatpost mounting strap which fits both standard and aero bars. The strap provides a quick release option which is excellent for commuters.features5 red ledsrechargeable lithium polymer battery2.5 hours full recharge timecateye sync app controlkinetic technology6 different light modesdaytime hyperflash and group ride modeopticube lens technologysuperior side visibilityrubber band mountweighs 43gdimensions 74.5 x 26 x 28mmbuy cateye lights from chain reaction cycles, the world's largest online bike store.