Product name Type Lithium battery Bulb Switch type Lithium lifejacket light YD11 CR17450(one pc) 2.5V,0.46A Water activity (manual off) Features: 1) Used to fit in the relative life jacket in sea and river ships 2) In accordance with amendment 1996 to SOLAS 1974, LSA, and MSC81.(70) 3) Operation time: more than 8hours 4) luminous intensity: more than 0.75cd