Tactical Flashlight With Integral Green Laser. AndQuick Detach Mount For 7/8 Picatinny Type Rails. This Item Fits “Full Size” Pistols. This item does “Not Fit” Sub-Compact or Micro Size Pistols. Will Fits Some Compact Pistols Such as Glock 19 19x SIG P229 But The. Unit Will Stick Out Past The Front End a Little Bit On These Compact Pistols. Also note that on some pistols such as Glock, the item will fit very tight and will require. Some effort to install. This is intentional as a loose fitting unit is undesirable. This or most any other similar unit on your pistol will scratch the rail mounting surface. Whyuse an LED instead of a Bulb? – LED lights are made from a semiconductorcrystal chip which, when activatedby a low electrical current, emitsan extremely precise wavelengths oflight with efficiency that other conventionallight bulbs cannot equal. Halogenbulbs work by heating up a tiny fragilefilament inside a glass bulb untilit radiates light which wastes a hugeamount of energy and produces heatwhich over a short period of timecan weaken and eventually break thefilament. The components of an LEDare encased in a durable high strengthepoxy. Unlike traditional light bulbs, LED lights have no glass or filamentwhich can break. This makes LED lightsperfect for rugged environments, heavyuse and hostile temperature extremes. With halogen lighting, the filamentcan break from sudden impact, vibrationor shock while LED lights are expectedto last up to 50 times longer thanyour typical bulb. LED is the wayof the future and you will start tosee more and more companies changingout the old bulbs for new LED technology. Notethat you must have a pre-existingWeaver/Picatinny type scope mountor rail system in order to attach this scope on your pistol/rifle/shotgun. Ambidextrous Momentary or Constant-On Switch. Rear Selector Mode Switch: for Laser Only, Flashlight Only, or Both Flashlight & Laser modes. 3 Watt Ultra-Bright High Output LED. Uses 2 CR123A Battery (Included). Both light and laser use the same batteries. Aluminum and Reinforced Nylon Construction. Laser is adjustable for windage/elevation. This laser flashlight combo allows for activation of the both light/laser simultaneously or the light/laser individually\. A toggle switch in the rear allows you to switch the activation method. Once activation method is selected a round ambidextrous twist type switch allows for permanent or momentary activation. Integral quick release mount will attach to most any Weaver/Picatinny rail or scope mount. Made to withstand heavy recoil. Does Not fit sub-compact pistols. Weighs:3 ounces empty. IncludesLED Flashlight with integral green laser, 2x CR123 batteries, Allen wrench for adjusting windage/elevationon laser. Thisis a quality all-purpose tactical flashlight/green laser unit that willfit many applications. Integral mount allows you to quicklyattach/detach this unit from most any Weaver or Picatinnystyle rail or scope mount. This item is brand new.