Lalizas Alkalite II water-activated flashing LED light for life jackets. This extra powerful LED light features water-activated flashlight technology, meaning it automatically operates when it comes into contact with water. The LED bulb provides a longer life and lower consumption. The life jacket LED light features a manual ON-OFF button to turn the LED on and off when out of water. Approved to USCG, SOLAS and MED. Alkaline Battery.