Trustfire TR-J1US 1000-Lumen Diving Flashlight 4 output modes with memory: Hi &gt; Mid &gt; Lo &gt; Strobe &gt; SOS Aerospace aluminum alloy with premium hard-anodized anti-abrasive Diving Flashlight, Waterproof IPX8 30m Durable LED emitter regulated to maximize light output and runtime Special heat sinking finish construction