HD70-S1 Inland Lantern consists of Fresnel plastic lens, plastic base, flasher and sunswitch and twin filament lamp, color-lamp for color light.It has a simple watertight structure of durability.

• HD70-S1 型内河航标灯由菲涅耳型塑料透镜、塑料灯座、闪光电路板、日光开关等组成，内装双丝灯泡，色光用染色灯泡。