The Lilley & Gillie MK2000S is a high-intensity LED navigation lantern designed for marine applications. With a rugged polycarbonate construction, it provides 360° visibility up to 5 nautical miles. Ideal for marking obstructions, the self-contained MK2000S is powered by user-replaceable batteries for up to 5 years of continuous operation. It meets IALA, USCG, and IEC standards for marine aids to navigation.