Strobe. Water resistant. Impact resistant. Fits full and compact handguns. Compatible with most existing weapon light holsters. Ambidextrous operation. Safe-mode battery shut-off. 550 max lumens with 2.5 hour max runtime. 136m beam distance. Includes: (5) rail inserts, (6) screws, (1) Allen wrench. Requires (1) CR123A battery (included). Aluminum construction. Color: Black. Boxed with hanging tab.