SpecificationsConstruction: MetalBattery: 389A (Included)Type: Red LaserMaximum Output Power: 5MwWavelength: 625-660MmLength:1.7 In.Weight: 1 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 20Mm Weaver Rails.Package Includes Three 389A Battery Cells (Included).Weaver Style Mount Can Be Easily Detached In Seconds.