Water resistant. Impact resistant. Designed to securely attach to rail and trigger of a GLOCK 42/43 pistol. White LED. 100 lumens with 1 hour runtime. Features a 10 minute auto shut-off. Serialized for positive identification. Ambidextrous switching. Tool less battery replacement without removal from the weapon. Windage and elevation screws mounted in brass brushings. Requires (2) CR1/3N batteries (included). Boxed with hanging tab.