Barska GLX 5mW Green Laser External riflescope style windage and elevation &lt;Class IIIA Laser Product, &lt;5mW power output Tactical edged bezel. If laser is put too close (less than 10 ft) The laser dot will not be seen as a complete dot.Please use laser at lease 10ft away 1-inch main tube, Diamond cut exterior grip Emits a highly visible intense green laser beam constantly, Powered by a high-capacity CR-123A lithium battery (1-piece battery included) Tactical-edged bezel into the strong T6 aluminum body for added protection Weight: 13.44 oz, Length: 5.6 inches Includes: 1-inch picatinny rail ring with removable cross-bar, on/off cap, momentary on/off long cable switch Comes with 1 high-capacity CR-123A lithium battery, Warranty: 1 -year limited