Combine the compact and easy-to-use ReefMaster RM-4K with the wide beam of the Sea Dragon 2000F and you have the perfect compact package for exploring reefs, wrecks and deeper dives where lighting will make your images and videos shine with color.  The Sea Dragon 2000F has an easy one-button design that cycles through three light intensity settings and has a rechargeable battery that lasts an hour at full power (2000 lumens).