Seac R2Compact light in aluminum housing for an excellent combination of versatility and power. Type of batteries: 4 - AAA alkaline batteries (not included) .Battery life: 22 hours, of which 2.5 at the maximum power . Maximum depth: 330 feet (100 meters) .Diameter/length:1.65in/6.5in (42 mm/143 mm). Weight: 9oz (256 g) . Switch: electromagnetic system . Seal: double O-ring for radial seal + L-Ring . Glass: tempered optical .Lumen: 282 LM.