Made of aircraft grade aluminum alloy, lightweight and solid construction. 200LM Bright CREE LED Red la-ser with precise windage and elevation adjustments. Easy switch between different modes - flashlight only, laser only, flashlight & laser. Fits Most full size handguns with Rail Mounts. DOES NOT FIT COMPACT/SUBCOMPACT MODELS 3 Modes Las-er Only Light Only La-ser & Flashlight Specification Finish:Aircraft Aluminum with Black Matte La-ser class: IIIA Wavelength: 650nm LED Bulb Lumen: 200 Lumens Output:5 mW Attachment/Mount Type: Picatinny, Weaver Range of Laser: Up to 300yard at night Battery Type: CR123A 1. Place the batteries inside the Battery Housing. Make sure the positive and negative are in correct position. 2. Place the switch on the position as shown on the Pic. Put the top part of the switch into the right position first then push the whole switch in. 3. Push the locking clamp, make sure to push the middle part of the clamp. Otherwise it would be very difficult to lock the clamp.