IRON JIA'S Tactical Mini Pistol Red Dot Laser Adjustable Compact Sight Fit Rail Mount 20mm Hunting Scopes Airsoft Class 3A laser sight (less than 2mw) Fit to 20mm standard weaver and Picatinny Rails Easy control of the ON/OFF switch Adjustable for the Windage and Elevation Light weight and compact design. <span class="a-text-bold">Material</span>Made ofHigh quality aluminum alloydurable and long service life . <span class="a-text-bold">Mini size</span> ,super lightweight ,that will noteffect on your shooting habits Fit for<span class="a-text-bold">20mm</span> standard weaver and Picatinny Rails The additional rails on the top , allowing a additionalaccessories to be mounted ,such as a tactical flashlight. Power supply by LR41 button cell , or AG3 ,three pieces <span class="a-text-bold">Note : </span>product come without battery Adjustable for windage and evelation , come with three sizes of allen wrenchs