Streamlight Stylus 3. Waterproof, ultra slim LED pen light  lasts up to 10,000 hours. Includes 3 AAAA alkaline batteries.

Battery Three (3) AAAA alkaline batteries Bulb 100,000 hour lifetime, hi-intensity Light Emitting Diode (LED), "solid-state bulb". LED available in Arctic White, Ice Blue, Navigation Green, Blaze Orange, or Flame Red. Material 6000 series tempered aircraft aluminum with anodized finish; non-slip knurled grip. Color Black Gold Silver Weight (with batteries) 1.1 Ounces Dimensions .38" (Dia.) x 6.21" (L) Run Time Over 10 hours Power Arctic White 12,000 millicandelas Ice Blue 5,000 millicandelas Navigation Green 15,000 millicandelas Blaze Orange 10,000 millicandelas Flame Red 16,200 millicandelas Special Features Waterproof; individually serialized; momentary blink switch and constant "on"; pocket clip

Now includes a "snoot" which eliminates "spill light". Perfect for using on a set. The beam is visible to what is being illuminated... thus you can use it on a dark set, without others seeing the actual bulb...a very discrete personal lighting instrument for up close work.