... to DC,easy to install and use,intellgent automatic charging,over load protection Pure sine wave wall-mounted ... install and use,intellgent automatic charging,over load,short circuit protection,over voltage ,low voltge protection,over temperature protection,low battery ... SINE WAVE (INVERTER MODE)Overload protection SELF SUPERVISIONTransfer switch rating 40A RELAYTransfer time AC to DC 5msNormal output ...