The Streamlight Stylus has a battery life 20 times greater than a standard flashlight, and it is available with multiple high-intensity LEDs. This water-resistant penlight runs on three AAAA batteries, and it features momentary blink and constant-on settings. The Stylus penlight runs up to 24 continuous hours to the 10% lumen output level, and it comes with a pocket clip and a glare guard protector.