This tiny LED flashlight from Streamlight is super bright, tough, and remarkably handy. It's so compact, you can carry it with you at all times. And it's very powerful. It offers 400% more lighting range than a penlight, and reflector optics that enhance the brightness of the LED (lighting two to three times the range of other keychain lights without optics). The tiny, durable, powerful Key-Mate is ideal for work, auto, and home. Streamlight flashlights are legendary for their dependability, and the Key-Mate is no exception. Its high-intensity, state-of-the-art LED lasts 100,000-hours, and the anodized, machined aircraft aluminum casing is virtually indestructible. Its high-capacity alkaline button cells allow it to run longer-and stay brighter-than any button cell keychain LED light. Run time: up to 96 hours. The Key-Mate also offers many "extras" that set it apart from other lights: - Versatile powder-coated spring steel pocket clip - Weatherproof - O-ring sealed - Rotary head switch. Little chance you'll accidentally turn it on. Plus, the Key-Mate is a convenient tool. Snap the breakaway lanyard around your neck or wrist. Use the snap hook with swivel for quick attachment/detachment from your belt loops, backpack, zipper pull, or key ring. And its powder-coated spring steel pocket clip lets you clip it to just about anything. - Super-bright 100,000-hour LED - Virtually unbreakable machined aircraft aluminum - Runs longer and stays brighter than any other button cell powered keychain LED light (with focusing optics) - Runtime: up to 96 hours - Virtually unbreakable machined aircraft aluminum - State-of-the-art, super bright 100,000-hour LED with focusing optics. Specifications: - Battery: 4 Alkaline Button Cells - Bulb: 100,000-hour high- intensity Light-Emitting Diodes (LEDs) with reflector optics. - Material: Anodized, machined aircraft aluminum 6000 series. - Color: Titanium - Weight (with batteries) .9 ounces - Dimensions: Head (D): .728, Body (D): .560, Length: 2.36 - Run Time: Up to 96 hours - Special Features: Reflector optics; Waterproof; Rotary head switch; Breakaway lanyard; Snap hook with swivel; Pocket clip Which LED is right for you? - White. Most popular for all-around use. Very close to natural light, which allows you to see "true color". - Green. Extremely bright. Great for outdoors because it preserves night vision. For hunters it won't spook game. - Blue. Extremely bright yet easy on the eyes. Ideal for various industrial and automotive applications. Also commonly used in forensics.