AQUASPEC AQLBA ALKALINE LIFEBUOY LIGHT Alkaline battery powered lifebuoy light. When the light enters the water, the head of LED lamp end will float upwards above water due to the gravity design. The light will automatically activate and output a flashing white light. F E ATU R E S : • 2x AA alkaline battery (replaceable) • MED Ship’s Wheel approved • 50 – 70 times/min flash frequency • Operation life: 14h over 2.0 cd at -1ºC • Five year battery shelf life.