Streamlight Protac 2.0 Rail Mount, Weaponlight, Rechargeable, 2,000 Lumens, Fits 1913 Rails, Anodized Finish, Black, Includes SL-B50 Battery Pack, Straight Pressure Switch, USB-C Charging Cable 89009 The high-performance ProTac 2.0 Rail Mount produces 2"000 lumens without sacrificing run time. Powered by the new SL-B50 battery pack that charges inside or outside of the light using a USB-C cord - no need to remove from your weapon.