... the switch,When lithium battery is full of power,pls insert iphone4,then turn on the switch on ... it is charging.When the lithium battery is dead,pls insert USB cable into it,connect other port with ... for lithium batter,after it is full of power,pls operate as above mention.specificaton:Output V: DC 5V ... sun or rain;aviod colliding.4.take it carefully to avoid dropping. battery extender case for iphone 4 ...