INCREDIBLY TOUGH TEMPERED METAL ALLOY MANUFACTURING PROVES TO OUTLAST AND ENDURE IN THE FIELD AGAINST THE ELEMENTS AND DEBRIS. COMPACT IN SIZE THAT DOESN'T PUT DOWN THE WEIGHT IN YOUR AIRSOFT. RED LASER OUTPUT THAT'S CAPABLE TO MOUNT ON 11MM/20MM RAILS. PACKAGE INCLUDES TWO LR44 BATTERY CELLS (INCLUDED). 11/22MM RAIL MOUNT CAN BE EASILY DETACHED IN SECONDS. In the Box 1X RED LASER AIMING DOT SIGHT W/ BARREL MOUNT Specifications: CONSTRUCTION METALBATTERY LR44 (INCLUDED)TYPE RED LASERMAXIMUM OUTPUT POWER 5MWWAVELENGTH 625-660MMLENGTH3.1 IN.WEIGHT 2.9 OZDIAMETER 10MM - 20MM / 12MM - 23MMCOLOR BLACK California Proposition 65 Warning: Cancer and Reproductive Harm - www.P65Warnings.ca.gov