GreatLite EXPE81 Search and Rescue Series E81 LED Flashlight Adjusts to 5 Light Modes: 125 Lumens, 250 Lumens, 500 Lumens, Flash and SOS Made of durable aircraft-grade aluminum with a premium anti-abrasive finish. Maximum output 500 Lumens Uses (2) CR123A Lithium batteries or (1) 18650 Li-ion battery Beam Distance up to 200 meters