KTV Drive Pro+ Alert Rear incorporates innovative Alert technology, which intelligently adjusts its outputs to signal deceleration and stopping, effectively communicating your actions to traffic and fellow cyclists Delivers powerful illumination with a maximum output of 150 lumens and a 20-hour runtime in Femto mode AI alert brake light function Offers six output modes, including highly disruptive Daytime Flash ensuring maximum visibility during daylight hours Utilizes Wide-Angle Optics lens design to provide 270Adeg of visibility Durable, rigorously tested to IPX7 Waterproofing standards Versatile mounting system attaches to aero or round seatposts Integrated USB stick allows convenient cable-free recharging 2 solid and 4 flash modes Co-molded body Includes silicone rubber mounting strap Model: KTV Pro+ Ai Rear Alert Lumens: 150 Modes: 6 Max Runtime: 20 hrs Rechargeable: yes Battery Capacity: 400 mAh Dimensions: 60 x 41 x 64mm Weight: 50g. Color: black