X-Blaze Extreme 850 Lumens LED Strobe Flashlight, Cree XM-L - Submersible up to 3-Ft Our newest addition to the Cree flashlight series, the Cree XM-L bulb gives out a maximum of 850 lumens of brightness Simple one-button tactical switch, toggles between high, low and strobe Anodized aircraft grade aluminum water-resistant compact body design The light can penetrate up to 180 yards (540 feet). Uses 2x 3V CR123 lithium battery (included) This flashlight is submersible for up to 3-ft, you can bring this flashlight with you for snorkeling