Hecto Drive 500XLCompact, durable cycling light with a machined aluminium body. It features built-in cooling fins and cut-outs for side visibility. Its single LED design provides up to an impressive 500 lumens of output and eight output modes - including a Daytime Flash mode. Runtime has increased by 2.5 hours for up to 20 hours. Charging is simple with an integrated cable-free USB stick. It securely straps to a variety of handlebar shapes and sizes.KTV Drive RearCompact, aero-post compatible safety light with two bright LEDs. It features a super lightweight, yet durable co-moulded construction that is IPX7 (waterproof) rated. Up to 20 hours of runtime (seven-hour increase) with highly improved optics. Its Wide Angle Lens offers over 180° 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 Hecto Drive 500XL/KTV Light Set FeaturesFrontHecto Drive 500XLMax Lumens: 500 lumens.Weight: 84g.Max Runtime: 20 hours.Recharge Time: 2.5 hours.RearKTV Drive RearMax Lumens: 10 lumens.Weight: 54g.Max Runtime:20 hours.Recharge Time: 3 hours.