Big Blue CF1100P Rechargeable Battery Focus LED Dive Light Manufacturer Bigblue Light Output: 110 Lm (level I), 275 Lm (level II), 550 Lm (level III), 1100 Lm (level IV) Casing Material: Aluminum alloy, anti-corrosive anodized Power Source: 18650 Li-ion rechargeable battery pack Safety Designs: Double O-ring sealed, safety valve