portable poewr bank 1.GS Patented Power bank. 2.high quality Core lithium-ion polymer 3.4200mAh Hot sales portable poewr bank with dual USB GS-YD1 GS Patented Power bank.1.Mini design, easy to carry, high capacity 4200mAh 2.Luxury design, White dumb light UV shell, Double USB interface 3.Portable battery charger Compatible with Ipad 1, 2, 3 and all tablet PC,and With all mobile phone charging ...