1:the cert is CCS and EC 2:lithium battery 3:suit for all the lifebuoy 4:the good quality and price

Lifebuoy Light
DFQD-L-A	DFQD-L-B
DFYD-L-A DFYD-L-B Luminous Intensity ≥2cd ≥2cd Time of Power ≥2h ≥2h Operation Voltage 2.9v 6v Adaptive Environment Temperature -30°C-+65°C -30°C-+65°C Adaptive Water Temperature -1°C-+30°C -1°C-+30°C Lighting Form Ever bright Flashing Flash Frequency   50-70time/min Color of Light White White

Lifebuoy light