Battery Charger is mainly for the Complementary function of battery maintenance of all Kinds of FRP Totally Enclosed Lifeboat,FRP Free Fall Lifeboat,FRP Fast Rescue Boat,and Rescue Boat,Working Voltage is 42V/AC 50/60HZ,Weight is 5.0KG,Protection class is IP56.The Lifeboat Battery Charger for Lifeboat or Rescue Boat is different.