SpecificationsConstruction: MetalBattery: Lr44 (Included)Type: Red LaserMaximum Output Power: 5MwWavelength: 625-660MmLength:3.1 In.Weight: 2.9 OzColor: BlackFeaturesIncredibly 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.