With "8" figured mount for laser 1"(25.4mm) and scope 1"(25.4mm)Additional mount provide which can hold the laser and fit on any 20mm width weaver rail baseUse 1x CR123A lithium disposable battery (excluded) ( Dot not use recharge battery on laser)Remote coiled pressuer switch: Press pressuer pad to on and release to offOnly E-HUNTER"s Surplus sells Tactical Green Laser Dot Outside Adjusted Rifle Scope Sight With 2 Mounts. If you are purchasing this from another seller on this product page it is a counterfeit.