The Lezyne 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. It delivers powerful illumination with a maximum output of 150 lumens and a 20-hour runtime in Femto mode. This light offers six output modes, including highly disruptive Daytime Flash ensuring maximum visibility during daylight hours. It utilizes our Wide-Angle Optics lens design to provide 270° of visibility, durable, rigorously tested to IPX7 Waterproofing standards. A versatile mounting system attaches to aero or round seatposts, and an integrated USB stick allows convenient cable-free recharging.