Streamlight's ultra-light ProTac 1L-1AA Dual Fuel Professional Tactical Light is the perfect personal carry light. Its small size is convenient, but its patented C4 LED technology can produce a piercingly bright beam of light, illuminating a dark alley or large room with ease. There are three distinct beam output levels. The CR123A lithium battery can produce a piercing 350-lumen light on it's high setting, while AA alkaline and lithium batteries produce 150 lumens on their highest setting. The low setting produces 40 lumens and can run up to 14 hours. The push-button tail switch makes one-handed operation simple and the unbreakable pocket clip and nylon holster ensure easy carry. The durable 6000 Series machined aircraft aluminum construction and impact-resistant Borofloat glass lens are lightweight enough for pocket storage and the casing is IPX7 waterproof to 1 meter for 30 minutes. At just over 4" in length, it is an ideal light for concealment and suits any profession or activity.