Product Name: CATEYE CatEye SYNC WEARABLE SL-NW100 Rear Light System that connects and synchronizes lights ・Turns all CatEyeSYNC compatible lights ON/OFF with one button ・Linked mode switching and flashing timing for CatEyeSYNC compatible safety lights ・Kinetic mode synchronization (※When connected to SYNC KINETIC) ・Battery auto-save function that switches the flashing pattern when the battery level is low Runtime [ ] indicates the estimated lighting time when the kinetic mode is activated approximately 60 times per hour 　High: Approximately 1.5 hours [Approximately 1.4 hours] (30 lumens) 　Low: Approximately 18 hours [Approximately 6 hours] (2 lumens) 　Flashing: Approximately 45 hours [Approximately 7 hours] (50 lumens) 　Rapid: Approximately 16 hours [Approximately 5 hours] (50 lumens) 　Daytime Hyper Flash: Approximately 25 hours [Approximately 6 hours] (50 lumens) 　Group Ride: [Approximately 5 hours] Notes ・It is in relatively good condition, but please understand that it is a used item before purchasing. ・Instruction manual and charging cable are not included. ・We will use simple packaging for shipping. ・Please check the photos and feel free to comment if you have any questions. Thank you for viewing.