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For simple commuting in low level light just add the Femto USB Drive Rear Bike Light from Lezyne. Choose from three different lighting modes to suit your needs with a maximum runtime of 15 hours. When it's time to charge, simply attach the included micro USB cable and you'll be good to go in 2 and a half hours.Wide Angle Optics lens - provides 270 degrees of visibilityLightweightRechargeable - with included micro USB cableIPX7 water resistance ratingMounting strap fits a variety of postsFlash 1/2/3 mode: 5 lumens / 15-hour runtimePulse mode: 5 lumens / 9-hour runtimeSolid mode: 5 lumens / 4.5-hour runtimeMax lumens: 5Max runtime: 15 hoursRecharge time: 2.5 hoursWeight: 23g