LED Navigation Light: LED boat light buoy is designed to ensure safety navigation and provide signal instructions. Light Effect: Single color twinkling, it will automatically extinguishes when in and dark, and turn off when the light is strong. Waterproof: IP65 waterproof, it can do many kinds of working on the water and used even in heavy rain, blizzards and other severe weather. Material: The light is made of high quality LED light, and PP PPS plastic sheel, and it is powered by 2pcs D batteries(not included), which can last for about 50 days. Application: Applied in maritime rescuing, highway repairs, field surveys, navigation warnings, fishing net auxiliary lights, etc. Specification: Material: PP PPS Plastic Lighting: Single Color Twinkling Battery: 2x D Battery (not included) Battery Life: About 50 days Waterproof Rate: IP65 Working: automatically flashing in dark Light Source: LED Weight: 100g Size Chart: 48x260MM/1.89x10.24inch Package Includes: 2 Piece Navigation Light (White+Blue) Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful online shopping!