The Cateye Sync Core 500 LM Front Light is a powerful main front light that’s the cornerstone of the CateyeSYNC lighting system. With 500 lumens and excellent side visibility, the SYNC Core gives you the power to see and be seen. Can be used alone or – better still – combined with other CatEyeSYNC enabled lights for unparalleled levels of 360-degree visibility, day or night. Cateye Sync Core 500 LM Front Light Features 500 Lumans output for maximum visibility The heart of the SYNC lighting system Premium textured polycarbonate body Compact and lightweight high power rechargeable headlight (500lm) Excellent daytime visibility in Daytime HyperConstant mode Superior side visibility Round beam pattern with OptiCube™ lens technology Built-in fast recharging circuit Li-ion rechargeable battery USB rechargeable (Micro-USB cable included) 5 light modes * Charging time: 3-6 hrs Mode memory function FlexTight™ bracket The Cateye Sync Kinetic 40/50 LM Rear Light is a Cateye Sync enabled light that increases your visibility as you slow.  With a built-in accelerometer that switches to burst mode as you decelerate, SYNC Kinetic gives you an extra level of defense. Use alone or in combination with other models in the CatEyeSYNC family for unparalleled levels of 360-degree visibility, day or night. Cateye Sync Kinetic 40/50 LM Rear Light Features 50 Lumans Built-in acceleration sensor for Kinetic mode (Automatically turns on High mode when deceleration is detected.) Mounts securely to the seat post with the rubber band (Ø12-32 mm) Lithium-ion polymer rechargeable battery USB rechargeable (Micro USB cable included) Low battery indicator Mode memory function Battery Auto Save (The mode automatically changes to flashing when the battery power gets low.) Main LED for visibility from distance Cateye Sync Lights Technology Synchronize all SYNC lights One touch turns all lights on/off Synchronized lights connection status indicator Control with Smartphone App Pair the lights (up to seven lights) Customize light modes View remaining battery level Turn on/off the lights Turn on/off synchronization with other lights Find me function lets the light flashing by tapping the button on app