Model SEP-83 build-in 2 pieces 3766125 Li-polymer battery, real 8000mAh capacity, 4 power indicators, super LED light with SOS, 2 USB output ports that can charge 2 devices at the same time. This model use high quality plastic housing, the touch felling is very good. And the function of this model is very powerful for outdoor life. This model usemonocrystalline solar panel that has a good conversion rate in low latitudes. Our price is based on the real capacity of the power banks and we can customize the capacity for the power bank according customers requirement.