Add a simple yet effective source of illumination to your ride with the Femto USB Drive Rear Bike Light from Lezyne. The lightweight light runs for a maximum of 15 hours with three lighting modes and a water resistant outer as standard.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