Nu-Dive Super LED Scuba Diving Flashlight for up to 100 feet Underwater (250 lumens) - Using 2 C size batteries Use Luxeon Rebel LED output at 250 Lumens, 5 hours burn time at maximum brightness, secure dial switch works well below and above water. Up to 30m or 100 feet Underwater  Ideal for Recreational Diving or Rescue Mission Special Polycarbonate Lens enables Wide-angle Beam Can be use above water as a regular flashlight but has wider beam? Underwater, its beam tighten due to a smaller spot due to different refractive index. Special Rippled Handle for Comfortable Handling