*Using the high efficient transforming mono-crystalline silicon and Poly-crystalline silicon.The transfer rate is up to above 15%. *Solar panel specification:5.5V/100mA *Li-ion battery capacity:1000-2000mAh,solar and direct current two ways for charging. *USB MINI 5PIN plug to charge *External voltage:4.8-5.8V(stand by battery will change voltage to 4.2V) *Internal wires of standby power will charge for battery which will constant current automatically up to 450mAh. *Max current(the current when red led change to green):50±20mA *USB 4PIN plug charge for mobile or other digital products *Output:5.5V/0.5A *Temperature range:0-40°C *Package:color box