450 lumens; 1.5 hours of runtime; Powered by (1) CR123 battery, loaded via a removable bezel; Compact 6061 Aluminum housing; Lockout mode to prevent accidental light activation; M1913/SIG and Glock sliding rail interface plates included for maximum location adjustment range on the rail; Ambidextrous push-button side switches, with momentary and latching modes; Compatible with all compact and full-size Sig Sauer pistols