Coleman 635B721 is a fuel lantern designed for providing illumination in outdoor environments. It features a durable construction and is easy to use and maintain. The lantern uses Coleman fuel, which is specially formulated for long storage life and includes a rust inhibitor to help prevent corrosion. The lantern has a built-in pump for pressurizing the fuel, and a valve for controlling the flow of fuel to the burner. The burner produces a bright, steady flame that can be adjusted to the desired brightness.