With 500 lumens and excellent side visibility the sync core gives you the power to see and be seen. Can be used alone or ndash better still ndash combined with other cateyesynctrade enabled lights for unparalleled levels of 360 degree visibility day or night. The heart of the sync lighting systembull premium textured polycarbonate bodybull 500 lm output for maximum visibilitybull superior side on visibility for added safetybull customise modes via the sync appbull power button communicates pairing and battery info green on ndash other lights are pairedoff ndash paired lights disconnectedgreen flash ndash low battery on rear lightsred flash ndash low battery on core headlight mode output runtimehigh 500 lm 2 hrsmiddle 150 lm 9 hrslow 100 lm 15 hrsdaytime hyperconstant 500 100 lm 18 hrsflashing 100 lm 130 hrs charging time 3 6 hrs usb 2.0weight 94g incl. Flextight bracket genuine innovation from the market leader a smarter solution for all cateye sync is an easier quicker and safer lighting solution for all types of cyclists from commuters to enthusiast riders. Cateye sync offersbull multiple lights in syncbull just one touch syncs allbull smarter visibility day or nightbull all angles coveredbull be seen all round year round road safety researchcateyes utilises data from the institute for traffic accident research and data analysis in japan. This important data is relevant to all modern cities with commuting cyclists across the globe.bull 78% of all fatal accidents occur in the daytime. Bull crossing collisions are most frequent but rear end and left right turn collisions are also common.bull 87% of human factor accidents are caused by a delay in noticing the cyclist. Cateye sync meansbull synchronisedbull customisablebull communicative synchronisedbull cateye sync is an easier quicker and safer lighting solution for many types of cyclists from commuters to enthusiast riders.bull cateye sync means easy on off ndash all lights can be turned on off through one switch on the front light. No separate remote required.bull cateye sync makes you stand out ndash synchronise the flash timing of rear lights for improved visibility to other vehicles on the road day or night. Customisablebull cateye sync is compatible with smartphones using the cateye sync app to set up and monitor up to 7 sync lights.bull exclude modes youre not going to use on the front sync core lightbull synchronise the sync rear lights so that they flash in unison.bull synchronise the sync rear lights to all activate in kinetic mode. Communicativebull the cateye sync app includes battery level information for all sync lights all communicated through the sync core front light switch.bull the sync core monitors power levels and connectivity eliminating any worries over whether your rear lights are still illuminated and synced while riding. No more checking behind you!bull the cateye sync apps ldquofind merdquo mode identifies which rear lights need charging if you are using multiple numbers of the same rear light. The smartphone cateyesynctrade app is required to pair the lights. Before you purchase be sure to check to see if your smartphone model is compatible. Cateyesynctrade compatible device listpc or mac with internet connection is required for firmware update of the cateyesynctrade lights.