Type of batteries: Four 1.5 V or 1.2 V AAA/LR03 rechargeable alkaline batteries (not included) • Burn time: 2.5 hrs at max power • Maximum usage depth: 100 meters • Dimensions: diameter 42 mm – length 143 mm • Weight: 256 g • On switch: electromagnetic system • Seal: Double radial seal O-ring + L-Ring • Glass: optical, tempered • Light intensity: 282 Lumens.