It is used to indicate the position of lifebuoy at sea at day and night. Main technical parameters: 1) Luminous color: orange; 2) Burning time: ≥15min; 3)Luminous intensity:≥2cd; 4) Duration of lighting: ≥2h; 5) Ambient temperature for use and storage: -30℃～+65℃; 6) Validity: 3 years.