<b>HUDAKWA Solar Panel Specification：</b><br> Solar Maximum Charge Power:<br><br>1.5W<br> Solar Maximum Charge Electrical Current:<br><br>300mA<br> Built-in <br><br>1700mAh Lithium Battery<br> External Charging Input:<br><br>DC 5V/0.5A<br> Maximum Output:<br><br>DC 6V/1.5A<br> Battery Life: <br><br>charging can be completed in one day under the condition of enough sunlight<br> Operation Temperature:<br><br>-24℉ to +251℃<br> Storage Temperature:<br><br>-22℉ to +158℉<br> Working Life:<br><br>3 to 5 years<br> Dimension: <br><br>approx.6.22*4.01*0.5in <br> Weight :<br><br>approx.188g<br>