We are PRECINTL, Co, LTD. based in Shenzhen, China. We are member of TradeKey.com since December, 2013. Our business is related to Industrial Machinery industry and we specifically deal in power bank,phone cases,phone lens. Please find our product details below: 4000mAh Power Bank Backup Portable External Battery Charger with dual-ports Product details: 1.Capacity: 4000mah 2.Input/Output: 5V/1A Â 3.Led power indication Â 4.StandardÂ USB output and micro usb input interface Â 5.Dual usb output, high safe. 5000mAh Power Bank Backup Portable External Battery Charger with Dual-ports Product details: Â 1.capacity: 5000mah 2.input/output: 5V/1A Â 3.led power indication Â 4.standardÂ USB output and micro usb input interface Â 5.dual usb output, high safe. Thank you for taking time to go through our business profile. If there are any questions, inquiries or comments, please feel free to contact us.