Lezyne KTV Drive+ 40 Rear Bike Light Compact, powerful, visible. The Lezyne KTV Drive+ 40 Rear Bike Light is a compact, powerful rear light that adds impressive visibility without taking up much seatpost space. The KTV Drive+ 40 has a 40-lumen max output in Day Flash mode, with Wide Angle Optics providing 270 degrees of visibility. 6 different light modes, from the disruptive Day Flash mode that lasts up to 12 hours, to the 5-lumen Femto mode that provides up to 45 hours of runtime for the longest rides. The light has a compact, sleek shape, and a mounting system that's compatible with aero and standard seatpost shapes. Features Lightweight and compact with a small form factor and powerful light output40-lumen max output in Day Flash Mode or a long, 45-hour runtime in Femto mode Wide Angle Optics for 270 degrees of visibility Compatible with standard and aero seatposts provides visibility on any bike IPX7 rated for a high level of waterproofness Specifications Battery Capacity400 m Ah Light Modes Economy (5 Lumens), Blast (20 Lumens), Pulse (20 Lumens), Day Flash (40 Lumens), Femto (5 Lumens)Runtime45 hours (Femto Mode) to 2. 5 hours (Blast Mode)Weight45 grams Waterproof Rating IPX7 | Lezyne | Ktv Drive+ 40 Rear Bike Light Black