Acebeam D20 V2.0 Diving Light Rated to 650+ Feet If you're studying, photographing, or just exploring underwater environments, then the Acebeam D20 V2.0 is perfect for you! The lens of the D20 V2.0 is one of the design secrets that makes it able to cast a far-reaching beam while enduring deep sea environments. The tempered glass lens is treated so that it allows for near-perfect light transmittance and withstands deep water and high water pressures. The D20 V2.0 has a depth rating of 200 meters (656 feet), so the light is safe to use for underwater diving, caving, and more! The D20 V2.0 is equipped with 3 output modes so you can handle almost anything while prepping for your dive, during your dive, or in emergency situations. The light emits a maximum of 2200 lumens for when you need full-power, long-range lighting; it also has a lower 530-lumen output perfect for dive prep, use on the boat, and when working with your hands. The D20 V2.0 even has an SOS mode that fires a 1200-lumen light beam over 1,100 feet away (the light itself is visible from even further away) for emergency rescue use! High-Capacity, USB-C Rechargeable 21700 Battery This dive light makes use of a single li-ion 21700 battery that provides long runtimes and is easy to recharge with its USB-C port. The included battery provides runtimes reaching 5.5 hours to outlast any undersea expedition. There is a battery status indicator on the light to keep users apprised of the remaining charge level while diving. A lock function makes it simple to prevent accidental activations of the light so it can't waste battery when not in use, and so you don't startle cautious marine life or blind other divers. Fully Optimized for Deep-Sea Endurance Every facet of the D20 V2.0's construction is built with surviving the deep sea in mind. While usable in both freshwater or saltwater environments, the corrosive nature of sea water was of primary concern. To minimize the effects of saltwater corrosion, this dive light is built with an aluminum alloy body which was then coated with a diamond-grade, anti-corrosion oxidation finish to support extensive use in oceans. Additionally, the switch was upgraded to SUS316 stainless steel, which is highly resistant to saltwater corrosion so the light stays in top working shape. The D20 V2.0 is also secured with double o-rings to protect the battery from water contamination down to the maximum depth.