FRONT:The Hecto Drive 500XL is a compact, durable cycling light with a machined aluminum body with built-in cooling fins and cutouts for side visibility. Its single LED design provides an impressive maximum output of 500 lumens and eight output modes, including a Daytime Flash mode. Offering up to 20 hours of total runtime, charging is simple with an integrated cable-free USB stick, and the light straps securely to a variety of handlebar shapes and sizes.REAR:Packing 150 lumens of output into a seatpost-friendly package, the Strip Drive Rear places five high-output LED emitters behind our latest Wide Angle Optics for 270-degrees of impressive side visibility. With 11 output modes and a 57 hour max runtime, there's an option for every setting and ride length—day or night. A versatile mounting system attaches to aero or round seatposts and recharging is handled by an included micro-USB cable.HECTO DRIVE 500XL SPECS:Max Lumens:500Max Runtime:20 hoursBattery Capacity (mAh):650Recharge Type:USB StickWeight:84gDimensions:68mm, 37.4mm, 53.2mmFeatures:IPX7, Daytime FlashSTRIP DRIVE REAR SPECS:Max Lumens:150Max Runtime:57 hoursRecharge Type:Micro USBWeight:54gDimensions:79.3mm, 36mm, 35.8mmFeatures:IPX7, Daytime Flash