LNK-SL3 lifejacket lights are alkaline battery-powered emergency lights to be installed on all kinds of life jackets. When the water sensors on the lights` main body contact water they will be automatically activated and keep outputting the flashing white light more than 0.75cd light intensity during at least 26 hours (13 hours at -1℃) which can uninterruptedly indicate the survivor’s location to increase the success rate of rescue. They can be manually turned off and turned on while the water sensors contact with water.