Lezyne KTV Drive Pro+ Alert Taillight Black. 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.