Streamlight Knucklehead LED Flashlight, Black: * Light Source: C4 LED technology, with a 50,000 hour lifetime * Lens: Unbreakable polycarbonate with silicone anti-scratch coating is assembled in a heavy duty bezel. O-ring sealed * Output: Dual wide pattern parabolic reflectors inset into larger textured reflector provide a smooth flood pattern for close-up work * Optimized electronics provide regulated intensity * Battery: Industrial rechargeable nickel-cadmium 4.8V, 1.8 amp hour, 4 cell sub-C can be recharged up to 1,000 times * Optional 4 AA alkaline non-rechargeable battery pack provides fast replacement with readily available batteries * On/Off: Sonic welded push button switch designed for extremely long life * A rubber dome push button actuator provides easy operation even when wearing heavy gloves * Dual C4 LED technology for extreme brightness * Full 360 degree rotation head with 210 degrees of articulation * IPX4 rated for water resistant operation * All openings O-ring sealed * 2 meter impact resistance tested * Removable magnet with 135lbs pull strength and integrated hook (on yellow and black models) * Serialized for positive identification