The 1785 PC Series Pocket Perfect LED Dive Lite w/ Batteries (Blue) from Ikelite is a compact, corrosion-resistant underwater LED light. Featuring a light output of 205 Lumens and a burn time in excess of 10 hr, this light is also depth rated down to 295' (90 m). It runs on 4 C cell alkaline batteries (included). A unique lock ring slides effortlessly to open the light for battery changes, and secures with a snap to prevent accidental flooding. There is also a locking switch for storage.