The Lezyne LED KTV Drive Rear Light is a compact, aero-post compatible safety light with two bright LEDs. It features a super lightweight, yet durable co-molded construction that is IPX7 (waterproof) rated. NEW -- Up to 20 hours of runtime (seven hour increase) with highly improved optics. Its Wide Angle Lens offers up to 270° of visibility. The KTV Drive rear provides up to 10 lumens and five output/flash modes. And it features an integrated USB stick for convenient cable-free recharging.Lezyne LED KTV Drive Rear Light SpecificationsMAX LUMENS: 10WEIGHT: 54gMAX RUNTIME: 20 hoursRECHARGE TIME: 3hours