We are PRECINTL, Co, LTD. based in Shenzhen, China. We are memberof TradeKey.com since December, 2013. Our business is related toIndustrial Machinery industry and we specifically deal in powerbank,phone cases,phone lens. Please find our product details below:4000mAh Power Bank Backup Portable External Battery Charger withdualports Product details: 1.Capacity: 4000mah 2.Input/Output:5V/1A  3.Led power indication  4.Standard USBoutput and micro usb input interface  5.Dual usb output, highsafe. 5000mAh Power Bank Backup Portable External Battery Chargerwith Dualports Product details:  1.capacity: 5000mah2.input/output: 5V/1A  3.led power indication  4.standard USB output and micro usb input interface  5.dual usb output, high safe. Thank you for taking time to gothrough our business profile. If there are any questions, inquiriesor comments, please feel free to contact us.