Features:1) Operation time: at lest 8 hours2) Luminosity intensity: at lest 0.75cd3) Chromaticity: white4) Flash frequency: 50 - 70 times/min 5) Used in sea and river life jackets6) Validity: 3/5 years7) Battery: lithium battery ( PH2703B is using seawater abttery)8) The lights are flash.