Streamlight's Stylus PenLight is a bright, long-running LED penlight with a long battery life and goes anywhere you need it. It is machined from an aluminum case with non-slip knurled grip with a black anodized finish. It features momentary or constant on operation, red LED bulb and is water resistant. Perfect for tactical use and covert operation while preserving night vision. Includes three AAAA size alkaline batteries, pocket clip and glare guard.