Streamlight Strion Series Flashlights are a whole new level in tactical flashlights. Ultra compact, ultra bright, super reliable - Strion tactical lights give you unmatched rechargeable technology where batteries can be charged while inside the light! Easily and quickly mount the lights on your rifle and you are ready for your next mission. Constructed from machined aircraft grade aluminum with anodized finish, the light uses either a Halogen bulb or Streamlight C4 LED Technology that give you superior light output 3x greater than conventional LEDs. When you need extremely compact, extremely bright, highly durable light - Streamlight Tactical Series Strion Flashlight is exactly what you've been looking for.