Water resistant. Impact resistant. Designed to securely attach to rail and trigger of a SIG SAUER P365 subcompact handgun. Three modes of operation: White light (1h runtime), White light/Red laser (1h runtime), Red laser only (11h runtime). Batteries replaceable with unit mounted on handgun and no resight necessary. Ambidextrous operation. Windage and elevation screws mounted in brass brushings. Contoured housing securely attached to trigger guard. Requires (2) CR1/3N batteries (included). Boxed with hanging tab. May not ship Post Office or International.