Features:1) Operation time: at lest 8 hours2) Luminosity intensity: at lest 0.75cd3)Flash frequency: 50 - 70 times/min 4) Used in sea and river life jackets 5) Validity: 3/5 years Product name Type Lithium Bulb Switch type Shell type Lithium battery lifejacket light YD6A CR17450(one pc) 2.5V,0.46A Water activity Whole