High capacity power bank 1.Long time of duration 2.Easy to charge for the solar charger bag, tent, etc. 3.CE, FCC, ROHS ... ,PS 54000mah or 20000mah power bank for laptop, iPad, iPhone, mobile phones, MP4A. Specifcation:Battery capacity: 20000ma/h / 54000ma ... solar panel, conversion rate " > 16%, normal life" >20 years. solar Power bank for Laptop, iPad, iPhone, mobile phones etc.