... ,environmental,can work when power outages -with many functions&emergency lights -max power:6.3W with mosquito killer/receive ... protection,safety3.with emergency lights& can work when power outages4.built-in DC6V4.5AH battery storage,single or double battery, high-intensity ... hoursD.Double battery high speed about 12 hours,low speed about 14 hours. with receive FM/mosquito killer /emergency light /mini ...