The Strip Drive Pro Alert 400+ Rear is Lezyne&';s most advanced tail light with custom-programmed alert technology. It intelligently adjusts its outputs to signal deceleration and stopping, effectively communicating your actions to traffic and fellow cyclists Advanced tail light with alert technology that detects deceleration and changes output mode correspondingly Engineered for impressive efficiency and runtime Provides the best beam pattern for optimal light dispersion in even the most challenging conditions Ten LEDs and a maximum output of 400 lumens / 80-hour runtime in Femto mode Seven different output modes, including AI alert function Wide Angle Optics: 270Adeg of visibility USB-C waterproof charging (cable sold separately) Aero and round seatpost compatible IPX7 Waterproofing standards 1400 mAh battery capacity Run Time: up to 80 hrs Recharge Type: USB-C (cable sold separately) Dimensions: 70 x 37 x 47mm Weight: 71g. Color: Black