The Professional Edition SS-Y41 Tactical flashlight is made of Military-Grade Aircraft aluminum Alloy. The lens is constructed with tempered glass and a Cree XML-T6 LED bulb. The Special Edition features 5 modes, High/Medium/Low/Strobe/SOS with simple tactical button operation. The overall construction is Shockproof, water resistant. The Tactical flashlight can work with our 3.7-4.2V 3200mAH Li-ion 18650 Battery and charger or (2 CR123a Li-ion batteries). The Flashlight provides 5 hours of full power and lamp life is rated at 100,000hrs. This simple design is great for tactical applications and extremely durable.