The spring is in permanent contact with the base of the bulb and the positive terminal of the batteries. The wire is in permanent contact with socket of the bulb. When not in use, the weight of the batteries compresses the spring and shuts off the contact with the wire and the batteries negative terminal. When the light is thrown into the water, it floats in vertical position immediately, thanks to its specific shape.
The batteries slide down in the tube and, with their weight, create the contact with the wire connected to the bulb. (Alkaline Batteries not included).
Includes mounting bracket. To secure the light on any tube or rail, horizontal or vertical (tube dia : 3/4″ to 1″). Supplied complete withscrews and nuts.
SOLAS 74.96 IMO AES A 689 (17) A 48 (66). 4 candlepower. Light duration: 2 hours.