The Lezyne KTV Drive STVZO Rear Light is a compact, high visibility safety light. STVZO lens controls light output direction. Durable, waterproof construction. Two LED system provides 11 lumens of output and up to 12 hours of runtime. Wide Angle Lens for up to 270° of visibility. Unique aero and round post compatible design. Integrated USB stick for convenient cable-free recharging.Lezyne KTV Drive STVZO Rear Light SpecificationsMAX LUMENS: 11WEIGHT: 54gMAX RUNTIME: 12 hoursRECHARGE TIME: 3 hours