Type of batteries: Three 1.5 V or 1.2 V AAA/LR03 rechargeable alkaline batteries (not included) • Burn time: 3 hrs at max power • Maximum usage depth: 100 meters • Dimensions: diameter 38 mm – length 127 mm • Weight: 138 g • On switch: pressure switch • Seal: Double radial seal O-ring + L-Ring • Glass: PMMA (acrylic glass) • Three modes: max power, reduced power, and intermittent flash • Light intensity: 150 Lumens.