The CatEye SYNC Combo Kit brings two powerful lighting elements to your bicycle, with the SYNC Core providing 500 lumens of illumination and the SYNC Kinetic featuring a built-in accelerometer to turn on high mode as you decelerate for extra safety. With the SYNC lighting system, you can easily pair up to seven lights and control them remotely with the smartphone app, turning them all on and off with one touch. Enjoy maximum visibility and stay safe day or night with this incredibly efficient combo set.