Versatile, no compromise lights suitable for both urban and trail use.System Includes: LED headlamp with internal Li-Ion battery, handlebar mounts and 4.5 hour chargerRun Time: 2 hours on High (350 lumens), 4 hours on Medium (200 lumens), 6 hours on Low (120 lumens) and 21 hours on Walk (00 lumens)One piece modular design with 4 light levels and flash modeWireless and USB rechargeableOffers less overall mass than its predecessor for a noticeably smaller and lighter packageAll NiteRider headlights feature CREE LED"sItem SpecificationsWeight172gBatteryLi-ionBulbLEDRun Time2 - 21 Hours