Dear Sir,we are looking to buy power bank for promotional item.specification.power bank features a battery capacity of 1000 mAH with an output capacity of 500 mAH.Designed with one USB port and one Micro USB port with a 1 Amp output.Includes a micro USB power cord to recharge the lithium ion battery.When charging your portable device, simply connect the USB charging cable that came with your device to the power bank.Included metal split keyring makes it easy to add this portable power bank to your keys or lanyard.Size: 1/2 x 2-1/8 x 1-1/2. Show More