ULTRAFIRE DV-R20 2000LM CREE LED Diving Video Flashlight/Underwater Camera Fill Light 100m Depth Bright LED Lighting Lamp Low power indication from special micro computer chipset, with Low power protection, which can prevent lithium ion battery from over discharge, and prevent the reverse polarity in constant circuit; There are double O rings to be fixed on the tail and head, which provide a waterproof of 100 meters The lens is made to be strong and hard diamond coated and anti-explosive, acrylic reflective location. 5C white light 110 coated lens, can effectively resist moisture spray, and make the underwater world visional with true scenery and make the best condition for picture taking. 30 days money back, 0.5 year warranty.