This light is similar to the Bigblue AL1200WP, but with a narrow beam angle at 10°. The AL1200NP offers great features including the 4 level push-button on/off switch, battery-level indicator, and rechargeable 18650 lithium ion battery. Light Source: 1 XML LED Light Output: 120-1200 Lumens Casing Material: Aluminum alloy, anti-corrosive anodized Power Source: Rechargeable Li-Ion 18650 Battery Safety Designs: Double o-ring sealed Angle Of Light Beam: 10 degree Color Temperature: 6500K Available Colors: Black Burn Time: 2 hrs (level IV), 5 hrs(level III) 10 hrs(level II) 20 hrs (level I) Maximum Depth: 100 Meters Tested Size: Dia. 35 x L. 145.1 mm Weight: 178 g (including battery) Bouyancy: -79 g (including battery) Switching System: Push-button with battery indicator Front Glass: Tempered optical glass Lanyard: Yes