Energizer Hard Case Tactical ROMEO 1-LED Compact Vest Light (Batteries Included) Compact and lightweight; 4.3" long, 3.75 ounces including 1AA Energizer Ultimate Lithium battery (included) Push button tail-switch regulates brightness with the touch of a finger Shines up to 43 lumens and red and blue lens caps aid in night vision and tracking MOLLE/OTV attachment clip with magnets easily attaches to vest Rugged design features a waterproof, aircraft-grade aluminum alloy body, shatterproof lens and nearly indestructible LED, waterproof IPX7